Dyfyniad APA

American Biology Teacher (National Association of Biology Teachers). National Association of Biology Teachers.

Dyfyniad Arddull Chicago

American Biology Teacher (National Association of Biology Teachers). National Association of Biology Teachers.

Dyfyniad MLA

American Biology Teacher (National Association of Biology Teachers). National Association of Biology Teachers.

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