APA (7th ed.) Citation

Cho Young Sun. (2011). Why?: Tenaga dan jirim.

Chicago Style (17th ed.) Citation

Cho Young Sun. Why?: Tenaga Dan Jirim. Orbit Buku, 2011.

MLA (8th ed.) Citation

Cho Young Sun. Why?: Tenaga Dan Jirim. 2011.

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