Gaya APA
Havers, J, A., Jr, F, W, S.
(1971).
Handbook Of Heavy Construction
(
2)
.
New York:
McGraw - Hill.
Gaya MLA
Havers, John, A.., Jr, Frank, W., Stubbs,.
"Handbook Of Heavy Construction".
2
New York:
McGraw - Hill,
1971.
Text.