Gaya APA
Hefni, A., Widayanti, E.
(2011).
Pengorbanan Seekor Kupu-2
.
Yogyakarta:
FlashBooks.
Gaya MLA
Hefni, Azizah., Widayanti, Elis.
"Pengorbanan Seekor Kupu-2".
Yogyakarta:
FlashBooks,
2011.
Text / Book.