Cita APA

Singer, S. F. 1. (1971). Is there an optimun level of population? New York, New York: McGraw-Hill.

Citación estilo Chicago

Singer, Siegfried Fred 1924-. Is There an Optimun Level of Population? New York, New York: McGraw-Hill, 1971.

Cita MLA

Singer, Siegfried Fred 1924-. Is There an Optimun Level of Population? New York, New York: McGraw-Hill, 1971.