APA-referens (7:e uppl.)
Stenzel Byrnes, I., Stenzel, A., & Cropp, J. (2007). The power of two: A twin triumph over cystic fibrosis (Updated and expanded edition.). University of Missouri Press.
Chicago-referens (17:e uppl.)
Stenzel Byrnes, Isabel, Anabel Stenzel, och Jennifer Cropp. The Power of Two: A Twin Triumph over Cystic Fibrosis. Updated and expanded edition. Columbia, Missouri: University of Missouri Press, 2007.
MLA-referens (9:e uppl.)
Stenzel Byrnes, Isabel, et al. The Power of Two: A Twin Triumph over Cystic Fibrosis. Updated and expanded edition. University of Missouri Press, 2007.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.