Dyfyniad APA

Johnsgard. Sandhill and Whooping Cranes. University of Nebraska Press.

Dyfyniad Arddull Chicago

Johnsgard. Sandhill and Whooping Cranes. University of Nebraska Press.

Dyfyniad MLA

Johnsgard. Sandhill and Whooping Cranes. University of Nebraska Press.

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