Cita APA (7a ed.)
Eckholm, E. P. (1976). Losing ground: Enviromental stress and world food prospects. Worldwatch Institute.
Cita estilo Chicago (17a ed.)
Eckholm, Erik P. Losing Ground: Enviromental Stress and World Food Prospects. Nueva York, EUA: Worldwatch Institute, 1976.
Cita MLA (9a ed.)
Eckholm, Erik P. Losing Ground: Enviromental Stress and World Food Prospects. Worldwatch Institute, 1976.
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