Dyfyniad APA

Landis, P. H. (1948). Population problems: A cultural interpretation. American Book Company.

Dyfyniad Arddull Chicago

Landis, Paul Henry. Population Problems: A Cultural Interpretation. New York: American Book Company, 1948.

Dyfyniad MLA

Landis, Paul Henry. Population Problems: A Cultural Interpretation. American Book Company, 1948.

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