Gaya APA

Earl, T, G., E.Davis, H. (1956). COMPOSITION AND PROPERTIES OF CONCRETE . New York: McGraw-Hill Book Company,INC.

Gaya MLA

Earl, TROXELL, George., E.Davis, Harmer. "COMPOSITION AND PROPERTIES OF CONCRETE". New York: McGraw-Hill Book Company,INC, 1956. Textbook.