The most popular and knowledgeable author is T. H. Coreman. It is taught all over the world. This is a standard book and comes at number 1 on your syllabus for graduation or post-graduation. It is available on Amazon, and there is a link below.
But before reading this book, I would advise you to read some other books, because it is very difficult. You can also prepare algorithm from computer geek notes.
Second book is Fundamentals of Computer Algorithms by Sartaj Sahni and Sanguthevar Rajasekaran Ellis Horowitz. This book is simple and very effective in your learning.Â
You can also buy Data Structures And Algorithms Made Easy and its author is Narasimha Karumanchi.
You can also buy Algorithms Design And Analysis by Udit Agarwal. It has a simple english and variety of questions. Even this book comprises 60–70% content from Coreman, but the questions will still be of great use to you.