Cita APA

Gallup, J. L., Sachs, J. D., & Mellinger, A. D. Geography and economic development.

Citación estilo Chicago

Gallup, John Luke, Jeffrey D. Sachs, and Andrew D. Mellinger. Geography and Economic Development.

Cita MLA

Gallup, John Luke, Jeffrey D. Sachs, and Andrew D. Mellinger. Geography and Economic Development.