Petroni, F. A., & Hirsch, E. A. (1971). Two, four, six, eight, when you gonna integrate? Behavioral Publications.
Cita Chicago (17th ed.)Petroni, Frank A., i Ernest A. Hirsch. Two, Four, Six, Eight, When You Gonna Integrate? New York: Behavioral Publications, 1971.
Cita MLA (8th ed.)Petroni, Frank A., i Ernest A. Hirsch. Two, Four, Six, Eight, When You Gonna Integrate? Behavioral Publications, 1971.
Atenció: Aquestes cites poden no estar 100% correctes.