Gaya APA
Manurung, Heldin. (2008).
English College Students (Business English 1) .
Depok:
Great Media.
Gaya Chicago
Manurung, Heldin.
English College Students (Business English 1).
Depok:
Great Media,
2008.
Text.
Gaya MLA
Manurung, Heldin.
English College Students (Business English 1).
Depok:
Great Media,
2008.
Text.
Gaya Turabian
Manurung, Heldin.
English College Students (Business English 1).
Depok:
Great Media,
2008.
Print.