O'Hara, V. (1990). The fitness option: Five weeks to healing stress (2nd ed.). Dawn.
Chicago-referens (17:e uppl.)O'Hara, Valerie. The Fitness Option: Five Weeks to Healing Stress. 2nd ed. Nevada City, CA: Dawn, 1990.
MLA-referens (9:e uppl.)O'Hara, Valerie. The Fitness Option: Five Weeks to Healing Stress. 2nd ed. Dawn, 1990.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.