Dyfyniad APA

National College of Education. Young people's science encyclopaedia.

Dyfyniad Arddull Chicago

National College of Education. Young People's Science Encyclopaedia.

Dyfyniad MLA

National College of Education. Young People's Science Encyclopaedia.

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