Gaya APA
Lubis, Gelora Mulia. (2010).
Sepotong Janji .
Solo:
Indiva Media Kreasi.
Gaya Chicago
Lubis, Gelora Mulia.
Sepotong Janji.
Solo:
Indiva Media Kreasi,
2010.
.
Gaya MLA
Lubis, Gelora Mulia.
Sepotong Janji.
Solo:
Indiva Media Kreasi,
2010.
.
Gaya Turabian
Lubis, Gelora Mulia.
Sepotong Janji.
Solo:
Indiva Media Kreasi,
2010.
.