Cita APA (7th ed.)
Greenhood, D., & Graeter, R. (1951). Mapping. University of Chicago.
Cita Chicago (17th ed.)
Greenhood, David, i Ralph Graeter. Mapping. Chicago: University of Chicago, 1951.
Cita MLA (9th ed.)
Greenhood, David, i Ralph Graeter. Mapping. University of Chicago, 1951.
Atenció: Aquestes cites poden no estar 100% correctes.