„This is, I believe, the first modern comprehensive treatise on its subject. The author appears to have read everything, he proves everything, and he has brought to light many interesting but generally forgotten results and methods. The book should be on the desk of everyone who might ever want to see a proof of anything from the basic theory....“ (SIAM Review)

„ ... An attractive, ingenious, and many time[s] humorous form increases the accessibility of the book....“ (Zentralblatt für Mathematik)

„Professor Burckel is to be congratulated on writing such an excellent textbook.... this is certainly a book to give to a good student [who] would profit immensely from it....“ (Bulletin London Mathematical Society)