Cita APA (7th ed.)

Keith,William M, & Lundberg, C. O. (2014). Public speaking: Choices and responsibility (International edition.). Wadsworth, Cengage Learning.

Cita Chicago (17th ed.)

Keith,William M, i Christian O. Lundberg. Public Speaking: Choices and Responsibility. International edition. Australia: Wadsworth, Cengage Learning, 2014.

Cita MLA (9th ed.)

Keith,William M, i Christian O. Lundberg. Public Speaking: Choices and Responsibility. International edition. Wadsworth, Cengage Learning, 2014.