https://www.physicsforums.com/threads/the-best-book-to-start-with-string-theory.446991/
B. Zwiebach, A First Course in String Theory
The best book to start with String Theory
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https://www.physicsforums.com/threads/the-best-book-to-start-with-string-theory.446991/
B. Zwiebach, A First Course in String Theory