Dyfyniad APA

Campbell, J., Schumann, F., Janzen, E., Wagner, B., & Polley, L. (1993). Saskatchewan. Trichomonas fetus in bulls in Saskatchewan.

Dyfyniad Arddull Chicago

Campbell, John, Fritz Schumann, Eugene Janzen, Brent Wagner, and Lydden Polley. Saskatchewan. Trichomonas Fetus in Bulls in Saskatchewan. 1993.

Dyfyniad MLA

Campbell, John, et al. Saskatchewan. Trichomonas Fetus in Bulls in Saskatchewan. 1993.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.