Cita APA (7th ed.)
Hirschfeld, G. (1973). The people: Growth and Survival. First cycle. Aldine Published for the Council for the Study of Mankind.
Cita Chicago (17th ed.)
Hirschfeld, Gerhard. The People: Growth and Survival. First Cycle. Chicago: Aldine Published for the Council for the Study of Mankind, 1973.
Cita MLA (9th ed.)
Hirschfeld, Gerhard. The People: Growth and Survival. First Cycle. Aldine Published for the Council for the Study of Mankind, 1973.
Atenció: Aquestes cites poden no estar 100% correctes.