Zinsser, W. (1985). On writing well: An informal guide to writing nonfiction (3rd ed.). Harper & Row.

Zinsser, William. On Writing Well: An Informal Guide to Writing Nonfiction. 3rd ed. New York: Harper & Row, 1985.

Zinsser, William. On Writing Well: An Informal Guide to Writing Nonfiction. 3rd ed. Harper & Row, 1985.