APA (7th ed.) Citation

Al-Ustath, A., & unknown. (1990). Evaluation of repair materials with emphasis on crack injection repair.

Chicago Style (17th ed.) Citation

Al-Ustath, Ahmed, and unknown. Evaluation of Repair Materials with Emphasis on Crack Injection Repair. 1990.

MLA (9th ed.) Citation

Al-Ustath, Ahmed, and unknown. Evaluation of Repair Materials with Emphasis on Crack Injection Repair. 1990.

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