String Theory, Vol. 2 (Cambridge Monographs on Mathematical Physics)
"The present volume succeeds in giving a detailed yet comprehensive account of our current knowledge of superstring dynamics.  The topics covered range from the basic construction of the theories to the most recent discoveries on their non-perturbative behaviour.  The discussion is remarkably self-contained (the volume even contains a useful appendix on spinors and supersymmetry in several dimensions), and thus may serve as an introduction to the subject, and as an excellent reference for researchers in the field."Mathematical Reviews"Polchinski's books are a classic textbook on string theory. And I recommend it to you if you want to start the study of string theory... the first volume is an excellent textbook and a great introduction to string theory. Presents some deep chapters, but overall a great book for any student interested in entering the world of string theory. The book is consistent with the objective set out, well written for graduate students and probably one of the best textbooks on the market about string theory and shall remain so for a long time. these two books are great and of excellent quality. The book is consistent with the goal set in the early chapters, presents clear language with few errors and with a high degree of mathematical rigor. The book contains an excellent range of problems and an excellent glossary and the educational value of this book is incalculable. Definitely these books are references for the study in string theory and it will stay with this position."Philosophy, Religion and Science Book Reviews Blog