APA

William Knowlton Zinsser, . (2006). On writing well : the classic guide to writing nonfiction. : Harper Perennial.

Chicago

William Knowlton Zinsser, . 2006. On writing well : the classic guide to writing nonfiction. : Harper Perennial.

Harvard

William Knowlton Zinsser, . (2006). On writing well : the classic guide to writing nonfiction. : Harper Perennial.

MLA

William Knowlton Zinsser, . On writing well : the classic guide to writing nonfiction. : Harper Perennial. 2006.