Gaya APA

Gregg, D, C., Swanson, C, P. (1968). Principles of chemistry . Boston: Boston: Allyn and Bacon; 1968.

Gaya MLA

Gregg, Donald, C.., Swanson, Carl, P.. "Principles of chemistry". Boston: Boston: Allyn and Bacon; 1968, 1968. Text.