Mantak Chia's books are at least easily available. Come to think of it here is a link for 16 of his books in PDF format.
http://english.grimoar.cz/?Loc=aut&Lng=2&New=469 One of the problems with Mantak Chia, however, is that in most of his books he seems to lift entire sections out of earlier books so there is a lot of repetition and not as much original material within these books. I used to say that if you've read three of his books, you've read most of them. He's very commercial.
Bruce Kumar Frantzis is a better author writing on Qigong. He has written 3 or four books but his 3 or 4 books say more than Mantak Chia's 16 books. Overall he is my favourite. His methods are written up in such a way that you can practice progressively more difficult/sophisticated exercises. It is well set up.
You might also type Qigong or Chi Kung into the search engine of U Tube. They have a number of basic Qigong exercises demonstrated for you to follow along with. Their Qigong films vary in the quality of the teaching, but it is a good additional resource and it is free.
Yang Jwing MIng isn't too bad. He writes on White Crane style Gungfu and Taiji as well as Qigong, but sometimes he explains things better than most. He has an engineering background and a knack for explaining abstract ideas using concrete examples. Like he compares our energy system to electrical circuits or to plumbing in useful ways. I sometimes explain things in similar ways thanks to him.
There is an old book, I forget the author, but it is called something like The Web that has No Weaver. It was written maybe in the late 70s or early 80s, but it is useful in explaining concepts from Traditional Chinese Medicine that are important to Qigong and how it fits within TCM. T.T. Liang, and Jou Tseng Hwa are reputable Taiji masters and authors that have something to say about Qigong as well. You might say that Taiji is a form of Qigong, but with martial arts applications. Ba Gua, another soft style martial art also includes a strong Qigong element. Circle walking (a Ba Gua basic method) alone will teach you a lot.
That is what comes off the top of my head. There are a lot of books that have pretty pictures, but not much content, sort of coffee table Qigong books. You know what I mean, a slick looking cover with a pretty girl in colourful silk Chinese pajamas, more photos than text. etc. If you find something like that in the library then it is free so it doesn't matter, but when buying books stick to the respected authors. The coffee table type Qigong books may contain little nuggets of useful information, but they generally aren't worth the book costs. Also just because the author is Chinese doesn't necessarily mean they are knowledgeable about Qigong, and the reverse in the case of western authors.