Citáce podľa APA (7th ed.)
Keyfitz, N. (1991). Population and Development within the Ecosphere: One View of the Literature (1. ed.). International Institute for Applied Systems Analysis.
Citácia podle Chicago (17th ed.)
Keyfitz, Nathan. Population and Development Within the Ecosphere: One View of the Literature. 1. ed. Laxenburg: International Institute for Applied Systems Analysis, 1991.
Citácia podľa MLA (8th ed.)
Keyfitz, Nathan. Population and Development Within the Ecosphere: One View of the Literature. 1. ed. International Institute for Applied Systems Analysis, 1991.
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