Gaya APA

Koob, D, D., Boggs, W, E. (1972). The Nature of Life (Ed. 1). Massachusetts: Addison-Wesley Publishng Company.

Gaya MLA

Koob, Derry, D.., Boggs, William, E.. "The Nature of Life". Ed. 1 Massachusetts: Addison-Wesley Publishng Company, 1972. Text.