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It's not pure punjabi. It's hindi kind of punjabi. The one which we normally listen in hindi movies! But this book is meant for teaching pure punjabi of Punjab which the book does not serve at all. It is more hindi than punjabi language. Don't go for it if you wish to learn real punjabi. And the most important thing is that usage of punjabi lipi or atleast hindi should have been done because the swaras and pronunciation of punjabi/hindi differ very much from English. Because of this it is not advisable to use this book because it neglects the main thing completely which is important to speak and learn any language.
Much of it is Hindi, as others have described. I do like the way it is laid out, but I do wish it gave pronunciation tips. (My husband is Punjabi but doesn't have the patience to teach without guidelines, hence the book. He reports that many of my pronunciations are hilarious since I have to guess)