Gaddie, R. E. (1977). Earthworms for ecology & profit. Ontario, Calif: Bookworm Pub. Co.
Trích dẫn kiểu ChicagoGaddie, Ronald E. Earthworms for Ecology & Profit. Ontario, Calif: Bookworm Pub. Co, 1977.
Deismireacht MLAGaddie, Ronald E. Earthworms for Ecology & Profit. Ontario, Calif: Bookworm Pub. Co, 1977.
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