APA (7th ed.) Citation

Al-Refai, A. S., & unknown. (1997). Surface roughness measurement using laser detection technique.

Chicago Style (17th ed.) Citation

Al-Refai, Abdurrahman Saleh, and unknown. Surface Roughness Measurement Using Laser Detection Technique. 1997.

MLA (9th ed.) Citation

Al-Refai, Abdurrahman Saleh, and unknown. Surface Roughness Measurement Using Laser Detection Technique. 1997.

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