Cita APA

Johnson, G. B., & George B. Johnson. Essentials of the living world. Dubuque, IA: McGraw-Hill.

Chicago Style Citation

Johnson, George B., i George B. Johnson. Essentials of the Living World. Dubuque, IA: McGraw-Hill.

Cita MLA

Johnson, George B., i George B. Johnson. Essentials of the Living World. Dubuque, IA: McGraw-Hill.