APA Style

Gula. (1991). Yogyakarta: Aditya Media.

Chicago Style

Gula. . Yogyakarta: Aditya Media, 1991. .

MLA Style

Gula. . Yogyakarta: Aditya Media, 1991. .

Turabian Style

Gula. Yogyakarta: Aditya Media, 1991. .