The names of best Guides/Books for ISRO (Indian Space Research Organisation) Scientist/Engineer Exam are as follows:

Mechanical Engineering Books

Fluid Mechanics
A Textbook of Fluid Mechanics by R. K. Bansal

Strength of Materials
Mechanics of Materials by B. C. Punmia

Theory of Machines and Vibrations
Theory of Machines by S S Rattan

Heat-Transfer Heat Transfer
10th revised Edition by J. P. Holman

Manufacturing
Manufacturing Science by A. Ghosh & A. K. Mallik

Machine Design
Design of Machine Elements,by V Bhandari

Engineering Mechanics
Engineering. Mechanics by R. K. Rajput

Thermodynamics
Engineering Thermodynamics,by P.K. Nag

Engineering Mathematics
Higher Engineering Mathematics, Author's Name: B. S. Grewal

Industrial Engineering
Industrial Engineering and Management, Author's Name: O. P. Khanna

Civil Engineering Books
Fluid Mechanics & Hydraulics
Hydraulics and Fluid Mechanics by Dr. P.N.Modi, Dr.S.M Seth

Strength of Materials
Strength of Materials by U.C.Jindala

Transportation Engineering
Khanna & Justo
Subash and Satyapaul

Soil Mechanics & Foundation Engineering
Basics and Applied Soil mechanics by Gopal Ranjan, A.S.R.Rao

Hydrology & Irrigation
Engineering Hydrology by K Subramanya
Irrigation Engineering and Hydraulic Structures by S.K Garg

Environmental Engineering
Environmental Engineering by S.K.Garg (Vol.1 and 2)

Design of steel structures
Design Of Steel Structures,by S.K Duggal

Surveying (Geomatics)
Surveying (vol. 1,2,3) by B.C.Punia, Askok jain, Arun Jain

Engineering Mathematics
Higher Engineering Mathematics,by B. S. Grewal

Structural Analysis
Basic Structural Analysis by C.S.Reddy

R.C.C Design R.C.C. Designs (Reinforced Concrete Structures) by B.C.Punmia, Ashok Kumar Jain, Arun Jain

Computer Science Engineering Books

Programming & Data Structures
The C Programming language,by Brian W. Kernighan , Dennis M. Ritchie

Algorithms
Introduction to Algorithms Thomas H. Cormen, Charles E. Leiserson, Ronald L. Rivest, and Clifford Stein,

Computer Organization
Computer Organization and Architecture,by Hamacher, Vranesic, Zaky

Digital Logic
Digital Logic & Computer Design by M. Morris Mano

Computer Networks
Computer Networking: A Top-Down Approach by James F. Kurose, Keith W. Ross

Operating Systems
Operating System Concepts,by Silberschatz, Galvin, Gagne

Database
Database System Concepts,by Silberschatz, Sudarshan, Korth

Compiler Design
Compilers: Principles, Techniques and Tools by Alfred V. Aho , Ravi Sethi , D. Jeffrey Ulman

Theory of computation
An Introduction to Formal Languages and Automata,by Peter Linz

Engineering Mathematics
Higher Engineering Mathematics, by B. S. Grewal

Microprocessor
Microprocessor Architecture Programming and Application by Ramesh Gaonkar

Image processing
Digital Image Processing by Esakirajan,Veeramani-

Electronics Engineering Books

Electromagnetics
Principles of Electromagnetics, by Mathew N.O. Sadiku

Communications
Principles of Communication Systems,by Goutam Saha , Herbert Taub , Donald Schilling

Electronic Devices
Semiconductor Physics and Devices by Donald A. Neaman, Dhrubes Biswas

Networks
Fundamentals of Electric Circuits,by Charles K. Alexander , Matthew N. O. Sadiku

Analog Circuits
Microelectronic Circuits : Theory and Applications,by Adel S. Sedra, Kenneth C. Smith

Digital circuits & Microprocessor
Digital Logic and Computer Design by M. Morris Mano

Control Systems
Automatic Control Systems,by Benjamin C. Kuo

Signals and Systems
Signals & Systems byAlan V. Oppenheim , Alan S.Willsky , S.Hamid Nawab

Engineering Mathematics
Higher Engineering Mathematics, by B. S. Grewal

Microwave Engineering
Microwave Engineering by David Pozar

Electrical Engineering Books

Analog and Digital Electronics
Integrated Electronics : Analog And Digital Circuits And Systems,by Christos C. Halkias, Chetan D. Parikh Jacob Millman

Control Systems
Control Systems Engineering,by I.J.Nagrath , M. Gopal

Measurements & Instrumentation
A Course In Electrical And Electronic Measurements And Instrumentation by A K Sawhney

Electrical Machines
Electrical Machinery by P. S. Bimbhra

Electromagnetic Theory
Engineering Electromagnetics by William H Hayt, John A Buck

Network Theory
Circuit Theory: Analysis & Synthesis by Abhijit Chakrabarti

Power Electronics
Power Electronics, by P.S.Bimbhra

Power System
Electrical Power Systems, by C. L. Wadhwa

Engineering Mathematics
Higher Engineering Mathematics, by: B. S. Grewal

Signals & Systems
Signals and Systems, by Oppenheim Alan V, Willsky Alan S, Nawab S. Hamid

Computer Engineering
Computer Engineering: Hardware Design by M. Morris Mano