Gaya APA
Sitanggang. (2018).
Driving forces .
Yogyakarta:
Global Pustaka Utama.
Gaya Chicago
Sitanggang.
Driving forces.
Yogyakarta:
Global Pustaka Utama,
2018.
Text.
Gaya MLA
Sitanggang.
Driving forces.
Yogyakarta:
Global Pustaka Utama,
2018.
Text.
Gaya Turabian
Sitanggang.
Driving forces.
Yogyakarta:
Global Pustaka Utama,
2018.
Print.