Gaya APA
Sullivan, W, G. (2009).
Engineering Economy / Fourteenth Edition/William G. Sullivan (^a1 ^bJilid 1).
New Jersey:
Prentice Hall.
Gaya MLA
Sullivan, William, G..
"Engineering Economy / Fourteenth Edition/William G. Sullivan".
^a1 ^bJilid 1
New Jersey:
Prentice Hall,
2009.
Text.