APA (7th ed.) Citation

Siregar, R. (2008). Harmoni. PT. Grafiti.

Chicago Style (17th ed.) Citation

Siregar, Ras. Harmoni. PT. Grafiti, 2008.

MLA (8th ed.) Citation

Siregar, Ras. Harmoni. PT. Grafiti, 2008.

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