Gaya APA

Ledbetter, R, L, P, ;, W, B. (1985). Construction planning, equipment, and methods (ed. 4). USA: McGraw-Hill.

Gaya MLA

Ledbetter, Robert, Leroy, Peurifoy, ;, William, Burl. "Construction planning, equipment, and methods". ed. 4 USA: McGraw-Hill, 1985. Text.