Dyfyniad APA

Crosby, A. W. (1994). Germs, seeds, & animals: Studies in ecological history. M.E. Sharpe.

Dyfyniad Arddull Chicago

Crosby, Alfred W. Germs, Seeds, & Animals: Studies in Ecological History. Armonk, New York: M.E. Sharpe, 1994.

Dyfyniad MLA

Crosby, Alfred W. Germs, Seeds, & Animals: Studies in Ecological History. M.E. Sharpe, 1994.

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