APA Citation

HERGE. (2017). Tujuh Bola Kristal. Jakarta: Gramedia.

Chicago Style Citation

HERGE. Tujuh Bola Kristal. Jakarta: Gramedia, 2017.

MLA Citation

HERGE. Tujuh Bola Kristal. Jakarta: Gramedia, 2017.

Warning: These citations may not always be 100% accurate.