Cita APA (7a ed.)
Eckholm, E. P. (1977). The Picture of Health: Enviromental Sources of Disease. World Watch Institute.
Cita estilo Chicago (17a ed.)
Eckholm, Erik P. The Picture of Health: Enviromental Sources of Disease. EUA: World Watch Institute, 1977.
Cita MLA (9a ed.)
Eckholm, Erik P. The Picture of Health: Enviromental Sources of Disease. World Watch Institute, 1977.
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