Gaya APA
Manurung, Heldin. (2003).
Communicative English Program (cet.1).
Jakarta:
Praninta Aksara.
Gaya Chicago
Manurung, Heldin.
Communicative English Program.
cet.1
Jakarta:
Praninta Aksara,
2003.
Text.
Gaya MLA
Manurung, Heldin.
Communicative English Program.
cet.1
Jakarta:
Praninta Aksara,
2003.
Text.
Gaya Turabian
Manurung, Heldin.
Communicative English Program.
cet.1
Jakarta:
Praninta Aksara,
2003.
Print.