Dyfyniad APA

Osborn, M., & Osborn, S. (1991). Public speaking. Houghton Mifflin.

Dyfyniad Arddull Chicago

Osborn, Michael, and Suzanne Osborn. Public Speaking. Boston: Houghton Mifflin, 1991.

Dyfyniad MLA

Osborn, Michael, and Suzanne Osborn. Public Speaking. Houghton Mifflin, 1991.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.