APA (7th ed.) Citation

Koontz, D. R. (1981). How to write best-selling fiction. Writer's Digest Books.

Chicago Style (17th ed.) Citation

Koontz, Dean R. How to Write Best-selling Fiction. Cincinnati, Ohio: Writer's Digest Books, 1981.

MLA (9th ed.) Citation

Koontz, Dean R. How to Write Best-selling Fiction. Writer's Digest Books, 1981.