Writing Comedy Sketches That Sell - Writers Write.
Books on Writing Comedy: Comedy Writing Step by Step by Gene Perret, Carol Burnett This is probably the best book about writing comedy I've read. It really explains to you in detail not only how to write sketch comedy material, but how to write for stand-up and sitcoms. You can get more jokes per topic with Gene Perret's method than any other joke writing method I've seen. Comedy Writing.