Gaya APA
DeGarmo, E, P. et al (2001).
Ekonomi Teknik : Engineering economy tenth edition Jilid 2 .
Jakarta:
prenhallindo.
Gaya MLA
DeGarmo, E., Paul. et al.
"Ekonomi Teknik : Engineering economy tenth edition Jilid 2".
Jakarta:
prenhallindo,
2001.
Text.