WALKER, R. (2005). Under the microscope the human body volume 4 making life: How we reproduce and grow. Grolier Educational.
Chicago-referens (17:e uppl.)WALKER, Richard. Under the Microscope the Human Body Volume 4 Making Life: How We Reproduce and Grow. Danbury: Grolier Educational, 2005.
MLA-referens (9:e uppl.)WALKER, Richard. Under the Microscope the Human Body Volume 4 Making Life: How We Reproduce and Grow. Grolier Educational, 2005.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.