Dyfyniad APA

Birkett, C. (1979). Heredity, development and evolution. Macmillan.

Dyfyniad Arddull Chicago

Birkett, Christine. Heredity, Development and Evolution. London: Macmillan, 1979.

Dyfyniad MLA

Birkett, Christine. Heredity, Development and Evolution. Macmillan, 1979.

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