Παραπομπή APA

Krebs, R. E. (2008). Encyclopedia of scientific principles, laws, and theories. Greenwood press.

Παραπομπή Chicago Style

Krebs, Robert E. Encyclopedia of Scientific Principles, Laws, and Theories. Westport: Greenwood press, 2008.

Παραπομπή MLA

Krebs, Robert E. Encyclopedia of Scientific Principles, Laws, and Theories. Greenwood press, 2008.