From the reviews:

"Parkes … has done an excellent job of explaining all the notations and processes in the beginning of the volume to permit readers to follow his descriptions. … The well-written text contains numerous diagrams and examples, and each chapter contains a problem set with answers in the back. … Overall, this is a very good introductory book for undergraduate computer science students. Summing Up: Recommended. Lower-and upper-division undergraduates, graduate students, and two-year technical program students." (H. J. Bender, Choice, Vol. 46 (6), February, 2009)

"This book focuses on the key theoretical aspects of computing, in particular formal languages and automata theory. … The book provides modern approaches for students who plan to choose CS as their first choice. Languages, machines and their properties are well documented by examples and exercises. It is interesting to note that the book provides solutions to exercises which will help students when working on their own. The book is well written and recommended for course adoption." (Prabhat Kumar Mahanti, Zentralblatt MATH, Vol. 1157, 2009)

"In this book, Parkes attempts to make the material accessible to a much wider and mathematically less sophisticated audience … . This book fills a niche for non-computer science majors, first- and second-year majors looking for an enrichment topic, and computer science programs that, for one reason or another, wish to offer the theory course with a minimum of prerequisites." (R. Roos, ACM Computing Reviews, March, 2009)

“It’s about the theory of formal languages, grammar and abstract machines … . What is special about this particular text book is that it attempts to introduce the very mathematical ideas of formal grammars and symbolic manipulation in a way that is easy to understand even if you don’t know much modern maths. … If you are looking for a textbook to base a course on, or need a refresher especially if your maths is a little rusty, this is a good choice … .” (Mike James, I Programmer, July, 2009)