Dyfyniad APA

Henderson, P. A., & Southwood, T. R. E. (2000). Ecological methods.

Dyfyniad Arddull Chicago

Henderson, P A., and T R E. Southwood. Ecological Methods. London, Blackwell science, 2000.

Dyfyniad MLA

Henderson, P A., and T R E. Southwood. Ecological Methods. 2000.

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