Cita APA (7th ed.)

Gregor, H. F. (1963). Environment and economic life: An economic and social geography. N. J. Van Nostrand.

Cita Chicago (17th ed.)

Gregor, Howard F. Environment and Economic Life: An Economic and Social Geography. Princeton: N. J: N. J. Van Nostrand, 1963.

Cita MLA (9th ed.)

Gregor, Howard F. Environment and Economic Life: An Economic and Social Geography. N. J. Van Nostrand, 1963.