Cita APA (7th ed.)
(1967). Great American wit. Hallmark Cards Inc..
Cita Chicago (17th ed.)
Great American Wit. Missouri: Hallmark Cards Inc., 1967.
Cita MLA (9th ed.)
Great American Wit. Hallmark Cards Inc., 1967.
Atenció: Aquestes cites poden no estar 100% correctes.