Dyfyniad APA

Trueman, A. E., Whittow, J. B., & Hardy, J. R. (1971). Geology and scenery in England and Wales (New ed., completely revised.). Penguin.

Dyfyniad Arddull Chicago

Trueman, A. E., J. B. Whittow, and John Richard Hardy. Geology and Scenery in England and Wales. New ed., completely revised. Harmondsworth: Penguin, 1971.

Dyfyniad MLA

Trueman, A. E., et al. Geology and Scenery in England and Wales. New ed., completely revised. Penguin, 1971.

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