Gaya APA

Peurifoy, R, L., Oberlender, G, D. (2002). Estimating construction costs (5th. Ed.). Singapore: McGraw-Hill.

Gaya MLA

Peurifoy, Robert, L., Oberlender, Garold, D.. "Estimating construction costs". 5th. Ed. Singapore: McGraw-Hill, 2002. Text.