How would i find out the value of an amos 'n' andy autographed copy of a radio show from 1935.?

Its a program from the original amos n andy radio episode. Its called "Amos' Wedding" Its apparently autographed by them. how will i find the value? p.s. Great condition! I also have a book called "Near and Far from the 1890's. It was printed in Germany Its a scriptured text... show more Its a program from the original amos n andy radio episode. Its called "Amos' Wedding" Its apparently autographed by them.

how will i find the value? p.s. Great condition!

I also have a book called "Near and Far from the 1890's. It was printed in Germany
Its a scriptured text book.

The name Castell Brothers, London; E.C. is also written on it.

Please let me know how to get a value of these very old books.?
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