"Amateurs and academics with an interest in the subject of variable stars will perhaps come to regard this as a modern classic."
The Royal Astronomical Society of Canada

"Tightly written, and frequently interspersed with figures and graphs, the book contains and enormity of fact and discussion...a formost authority on Variable Stars...is a marvellous repository of information. As such it is an ideal textbook for a serious student, or a reference book for the amateur astronomer.: —Astronomy & Space

"If you want a comprehensive guide to the science of variable stars, you can't go wrong with a book written by John Percy, a world authority on variable star observation...as a guide to understanding modern variable star research, it's essential." —BBC Sky at Night

"It is certainly the most up-to-date readable description of the various types of variable stars and what is known about each...Basically, if you observe variable stars, you should read and probably own this book." —HTN of the AAVSO