WALKER, R. (2005). Under the microscope the human body volume 1 heart: How the blood gets around the body. Grolier Educational.
Chicago-referens (17:e uppl.)WALKER, Richard. Under the Microscope the Human Body Volume 1 Heart: How the Blood Gets Around the Body. Danbury: Grolier Educational, 2005.
MLA-referens (9:e uppl.)WALKER, Richard. Under the Microscope the Human Body Volume 1 Heart: How the Blood Gets Around the Body. Grolier Educational, 2005.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.