Dyfyniad APA

Perrins, C., Cameron, A., & Hutchinson, P. (1984). Bird life: An introduction to the world of birds. Peerage.

Dyfyniad Arddull Chicago

Perrins, Christopher, Ad Cameron, and Peter Hutchinson. Bird Life: An Introduction to the World of Birds. London: Peerage, 1984.

Dyfyniad MLA

Perrins, Christopher, et al. Bird Life: An Introduction to the World of Birds. Peerage, 1984.

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