Dyfyniad APA

PURVES, W. K., & ORIANS, G. H. (1983). Life: The science of biology. Sinauer Associates Williard Grant Press.

Dyfyniad Arddull Chicago

PURVES, William K., and Gordon H. ORIANS. Life: The Science of Biology. Sunderland: Sinauer Associates Williard Grant Press, 1983.

Dyfyniad MLA

PURVES, William K., and Gordon H. ORIANS. Life: The Science of Biology. Sinauer Associates Williard Grant Press, 1983.

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