Dyfyniad APA

GILBERTSON, D. (1989). Practical Ecology For Geography And Biology. Croom Helm.

Dyfyniad Arddull Chicago

GILBERTSON, DD. Practical Ecology For Geography And Biology. Croom Helm, 1989.

Dyfyniad MLA

GILBERTSON, DD. Practical Ecology For Geography And Biology. Croom Helm, 1989.

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