I posted this info previously, but did a re: , and so am making it easier for all interested to find;
If you want an english pattern booklet you can get one from this ebay seller, she self-publishes her great crochet patterns. (please do respect her copyright.)
How to Crochet Adorable Amigurumi Animals
the above seller has the least expensive amigurumi pattern collection that I know of, all others I have seen are one-offs, or are in Japanese (most Japanese books have very clear charts, experienced crocheters should find them easy to use) search ebay for amigurumi and you will find Japanese books.
I have not seen knitted designs, but they are stitched in rounds, maybe you would able to transpose?
Jean