Oksaki's thesis, the basis for the book, is available online for free: http://www.cs.cmu.edu/~rwh/theses/okasaki.pdf http://www.cs.cmu.edu/~rwh/theses/okasaki.

Oksaki's thesis, the basis for the book, is available online for free: http://www.cs.cmu.edu/~rwh/theses/okasaki.pdf http://www.cs.cmu.edu/~rwh/theses/okasaki.pdf The book itself is available on Kindle.