From the reviews
Foundations of Physics, on the first edition:
"... the dedicated reader...will be well versed in this fascinating area of theoretical physics."
Physics Today, on the first edition:
"...presents a pedagogical survey on string theory. It covers material from early developments to present-day research ... divided into three parts ... results of quantization, string field theory, and phenomenology ... an impressive effort..."
FOUNDATIONS OF PHYSICS
"Kaku’s book, at 568 pages, is a comprehensive, self-contained text on string theory…[It] contains useful summaries of mathematical topics such as index theory, cohomology, and Kahler manifolds. This is a book for the really serious student of string theory; the dedicated reader who emerges after page 568 will be well versed in this fascinating area of theoretical physics.”