Gaya APA
L, P., D, O.
(2002).
Estimating Construction Costs
(
Fifth Edition)
.
America:
McGraw-Hill.
Gaya MLA
L, Peurifoy,Robert., D, Oberlender,Garold.
"Estimating Construction Costs".
Fifth Edition
America:
McGraw-Hill,
2002.
Textbook.