APA引文

Gaddie, R. E. (1977). Earthworms for ecology & profit. Ontario, Calif: Bookworm Publishing.

Trích dẫn kiểu Chicago

Gaddie, Ronald E. Earthworms for Ecology & Profit. Ontario, Calif: Bookworm Publishing, 1977.

MLA引文

Gaddie, Ronald E. Earthworms for Ecology & Profit. Ontario, Calif: Bookworm Publishing, 1977.

警告：这些引文格式不一定是100％准确.