ksh documentation/books needed

[Andrew H. White]

i previously posted an article but somehow the body of the text never
made it. so here goes again. i am posting this for someone else who
has obtained source for the ksh on sunOS 4.0.3. they are interested in
using it but they are having trouble finding good documentation and/or
literature. if someone could point me to an ftp site, a book title or
something else for this general purpose, i would appreciate it.
thx