Johnson, G. B., & George B. Johnson. Essentials of the living world. Dubuque, IA: McGraw-Hill.
Chicago Style CitationJohnson, George B., i George B. Johnson. Essentials of the Living World. Dubuque, IA: McGraw-Hill.
Cita MLAJohnson, George B., i George B. Johnson. Essentials of the Living World. Dubuque, IA: McGraw-Hill.
Atenció: Aquestes cites poden no estar 100% correctes.