APA (7th ed.) Citation

Koay,Mary. (2004). Learn About Sound. Pintar Firus Sdn. Bhd.

Chicago Style (17th ed.) Citation

Koay,Mary. Learn About Sound. Selangor: Pintar Firus Sdn. Bhd, 2004.

MLA (9th ed.) Citation

Koay,Mary. Learn About Sound. Pintar Firus Sdn. Bhd, 2004.

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