Astor, R., & Jeffereys, K. (2000). Positive initiatives for people with learning difficulties: Promoting healthy lifestyles. Macmillan Press.
Dyfyniad Arddull ChicagoAstor, Roberta, and Karen Jeffereys. Positive Initiatives for People with Learning Difficulties: Promoting Healthy Lifestyles. Hampshire: Macmillan Press, 2000.
Dyfyniad MLAAstor, Roberta, and Karen Jeffereys. Positive Initiatives for People with Learning Difficulties: Promoting Healthy Lifestyles. Macmillan Press, 2000.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.