Cita APA

Black, J. D. n. 1., & Black, J. D. n. 1. (1993). Introduction to economics for agriculture. New York, New York: Macmillan.

Citación estilo Chicago

Black, John Donald n. 1883, y John Donald n. 1883 Black. Introduction to Economics for Agriculture. New York, New York: Macmillan, 1993.

Cita MLA

Black, John Donald n. 1883, y John Donald n. 1883 Black. Introduction to Economics for Agriculture. New York, New York: Macmillan, 1993.