Jakab, C. (2006). The digestive system. Smart Apple.
Cita Chicago Style (17a ed.)Jakab, Cheryl. The Digestive System. North Mankato, Minn.: Smart Apple, 2006.
Cita MLA (8a ed.)Jakab, Cheryl. The Digestive System. Smart Apple, 2006.
Precaución: Estas citas no son 100% exactas.