Lua APA (7ú heag.)

Pirages, D. C., & Ehrlich, P. R. (1974). Ark II: Social response to environmental imperatives. Freeman.

Lua i Stíl Chicago (17ú heag.)

Pirages, Dennis C., agus Paul R. Ehrlich. Ark II: Social Response to Environmental Imperatives. San Francisco: Freeman, 1974.

Lua MLA (9ú heag.)

Pirages, Dennis C., agus Paul R. Ehrlich. Ark II: Social Response to Environmental Imperatives. Freeman, 1974.

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