Gaya APA
Manurung, Heldin. (2003).
Communicative english program .
Jakarta:
Penerbit Praninta Aksara.
Gaya Chicago
Manurung, Heldin.
Communicative english program.
Jakarta:
Penerbit Praninta Aksara,
2003.
Text.
Gaya MLA
Manurung, Heldin.
Communicative english program.
Jakarta:
Penerbit Praninta Aksara,
2003.
Text.
Gaya Turabian
Manurung, Heldin.
Communicative english program.
Jakarta:
Penerbit Praninta Aksara,
2003.
Print.