Gaya APA
Manurung, Heldin. (2002).
Conceptual english conversation .
Jakarta:
Penerbit Great Media.
Gaya Chicago
Manurung, Heldin.
Conceptual english conversation.
Jakarta:
Penerbit Great Media,
2002.
Text.
Gaya MLA
Manurung, Heldin.
Conceptual english conversation.
Jakarta:
Penerbit Great Media,
2002.
Text.
Gaya Turabian
Manurung, Heldin.
Conceptual english conversation.
Jakarta:
Penerbit Great Media,
2002.
Print.