Cita APA (7a ed.)

Osborn, M. (1988). Public speaking. Houghton Mifflin Co..

Cita Chicago Style (17a ed.)

Osborn, Michael. Public Speaking. Boston: Houghton Mifflin Co., 1988.

Cita MLA (9a ed.)

Osborn, Michael. Public Speaking. Houghton Mifflin Co., 1988.