APA (7th ed.) Citation

Chai, C. Y. (2011). Digital security locking system – USB based GSM security system.

Chicago Style (17th ed.) Citation

Chai, Chong Yi. Digital Security Locking System – USB Based GSM Security System. 2011.

MLA (9th ed.) Citation

Chai, Chong Yi. Digital Security Locking System – USB Based GSM Security System. 2011.

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