Cita APA (7th ed.)

Astor, R., & Jeffereys, K. (2000). Positive initiatives for people with learning difficulties: Promoting healthy lifestyles. Macmillan Press.

Cita Chicago (17th ed.)

Astor, Roberta, i Karen Jeffereys. Positive Initiatives for People with Learning Difficulties: Promoting Healthy Lifestyles. Hampshire: Macmillan Press, 2000.

Cita MLA (9th ed.)

Astor, Roberta, i Karen Jeffereys. Positive Initiatives for People with Learning Difficulties: Promoting Healthy Lifestyles. Macmillan Press, 2000.