Dyfyniad APA

Allaby, M. (1996). Basics of environmental science (2nd ed.). Routledge.

Dyfyniad Arddull Chicago

Allaby, Michael. Basics of Environmental Science. 2nd ed. London: Routledge, 1996.

Dyfyniad MLA

Allaby, Michael. Basics of Environmental Science. 2nd ed. Routledge, 1996.

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