Griffin, C. L. (2018). Invitation to public speaking (Sixth edition.). Cengage Learning.
Citazione stile Chigago Style (17a edizione)Griffin, Cindy L. Invitation to Public Speaking. Sixth edition. Boston, MA: Cengage Learning, 2018.
Citatione MLA (9a ed.)Griffin, Cindy L. Invitation to Public Speaking. Sixth edition. Cengage Learning, 2018.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.