Gaya APA

Cheronis, N, D., B., I, P, J. (NULL). The Study of the physical World . USA:: USA: Riberside Press Cambridge; 1958.

Gaya MLA

Cheronis, Nicholas, D.., B., I., Parsons,, James. "The Study of the physical World". USA:: USA: Riberside Press Cambridge; 1958, NULL. Text.