Cita APA (7th ed.)
Fradon, D. Breaking the Laugh Barrier: An Original Cartoon Book. Dell.
Cita Chicago (17th ed.)
Fradon, Dana. Breaking the Laugh Barrier: An Original Cartoon Book. Nueva York, EUA: Dell.
Cita MLA (9th ed.)
Fradon, Dana. Breaking the Laugh Barrier: An Original Cartoon Book. Dell.
Atenció: Aquestes cites poden no estar 100% correctes.