APA (7th ed.) Citation

(2019). Helly Si Helikopter. Gramedia Pustaka Utama.

Chicago Style (17th ed.) Citation

Helly Si Helikopter. Gramedia Pustaka Utama, 2019.

MLA (8th ed.) Citation

Helly Si Helikopter. Gramedia Pustaka Utama, 2019.

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