Gaya APA
Peurifoy, R, L. (2004).
(PASCA - TEKNIK SIPIL) Estimating Construction Costs (Edisi 15).
Singapore:
Mc Graw-Hill International Book Company.
Gaya MLA
Peurifoy, Robert, L..
"(PASCA - TEKNIK SIPIL) Estimating Construction Costs".
Edisi 15
Singapore:
Mc Graw-Hill International Book Company,
2004.
.