Gaya APA

Degarmo, E, P., at.all), (. (1997). Ekonomi teknik = engineering economy, Jl. 2 (10). Jakarta: Prenhallindo.

Gaya MLA

Degarmo, E., Paul., at.all), (. "Ekonomi teknik = engineering economy, Jl. 2". 10 Jakarta: Prenhallindo, 1997. Text.