APA (7th ed.) Citation

Gribbin, M. d. J. (1997). Ruang & Waktu. Balai Pustaka.

Chicago Style (17th ed.) Citation

Gribbin, Mary dan John. Ruang & Waktu. Balai Pustaka, 1997.

MLA (8th ed.) Citation

Gribbin, Mary dan John. Ruang & Waktu. Balai Pustaka, 1997.

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