Gaya APA
Degarmo,{et.all}, E., P. (1999).
Ekonomi Teknik : Engineering Economy Tenth Edition Jilid 1 (Edisi 10).
Asia:
Prentice-Hall, Inc.
Gaya MLA
Degarmo,{et.all}, E., P..
Ekonomi Teknik : Engineering Economy Tenth Edition Jilid 1.
Edisi 10
Asia:
Prentice-Hall, Inc,
1999.
Text.