Gaya APA
Nasution, S.. (2012).
Metode Research (2012).
Jakarta:
Bumi Aksara.
Gaya Chicago
Nasution, S..
Metode Research.
2012
Jakarta:
Bumi Aksara,
2012.
Text.
Gaya MLA
Nasution, S..
Metode Research.
2012
Jakarta:
Bumi Aksara,
2012.
Text.
Gaya Turabian
Nasution, S..
Metode Research.
2012
Jakarta:
Bumi Aksara,
2012.
Print.