Dyfyniad APA

Journal of Environmental Health. National Environmental Health Association (NEHA).

Dyfyniad Arddull Chicago

Journal of Environmental Health. National Environmental Health Association (NEHA).

Dyfyniad MLA

Journal of Environmental Health. National Environmental Health Association (NEHA).

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