Dyfyniad APA

ASSE Journal. American Society of Safety Professionals (ASSP).

Dyfyniad Arddull Chicago

ASSE Journal. American Society of Safety Professionals (ASSP).

Dyfyniad MLA

ASSE Journal. American Society of Safety Professionals (ASSP).

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