Gaya APA

Degarmo, E, P. (1999). Ekonomi Teknik (Engineering Economy Tenth Edition) Jilid 1 . JAKARTA: Prenhallindo.

Gaya MLA

Degarmo, E., Paul. "Ekonomi Teknik (Engineering Economy Tenth Edition) Jilid 1". JAKARTA: Prenhallindo, 1999. Text.