Books or websites for Functions

can anyone give me the name/names of books or websites that have a GOOD set
of examples and descriptions of functions. The ones with MS excell are just
vague enough to help. This website is a help, but I can't always take it with
me. If I could print out info and examples to help me understand the
construction of functions, I might be a better earthling, i mean person.
--
humanoid/earthling
.

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