APA Style
Widyastuti, V., Widhayati, M.
(2015).
Petualangan Sekeping Kancing
.
Yogyakarta:
Kanisius.
MLA Style
Widyastuti, Veronica., Widhayati, Mira.
"Petualangan Sekeping Kancing".
Yogyakarta:
Kanisius,
2015.
Text.