Cita APA (7a ed.)

Gallup, J. L., Sachs, J., & Mellinger, A. D. (1998). Geography and economic development. National Bureau of Economic Research.

Cita Chicago Style (17a ed.)

Gallup, John Luke, Jeffrey Sachs, y Andrew D. Mellinger. Geography and Economic Development. Cambridge, MA: National Bureau of Economic Research, 1998.

Cita MLA (9a ed.)

Gallup, John Luke, et al. Geography and Economic Development. National Bureau of Economic Research, 1998.