Dyfyniad APA

Devlin, J. C., & Naismith, G. (1977). The world of Roger Tory Peterson: An authorized biography. NYT Times Books.

Dyfyniad Arddull Chicago

Devlin, John C., and Grace Naismith. The World of Roger Tory Peterson: An Authorized Biography. New York: NYT Times Books, 1977.

Dyfyniad MLA

Devlin, John C., and Grace Naismith. The World of Roger Tory Peterson: An Authorized Biography. NYT Times Books, 1977.

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