Clayton, N. (1997). Young living (Seventh edition.). Glencoe/McGraw-Hill.
Dyfyniad Arddull ChicagoClayton, Nanalee. Young Living. Seventh edition. New York: Glencoe/McGraw-Hill, 1997.
Dyfyniad MLAClayton, Nanalee. Young Living. Seventh edition. Glencoe/McGraw-Hill, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.