APA (7th ed.) Citation

(1990). Empat GBHN 1973.1978.1983.1988. Bumi Aksara.

Chicago Style (17th ed.) Citation

Empat GBHN 1973.1978.1983.1988. Bumi Aksara, 1990.

MLA (8th ed.) Citation

Empat GBHN 1973.1978.1983.1988. Bumi Aksara, 1990.

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