APA (7th ed.) Citation

Al-Yousef, A. K., & unknown. (1990). Performance of slow sand filters in treating secondary effluent using different sizes of local sand.

Chicago Style (17th ed.) Citation

Al-Yousef, Ali Khamis, and unknown. Performance of Slow Sand Filters in Treating Secondary Effluent Using Different Sizes of Local Sand. 1990.

MLA (9th ed.) Citation

Al-Yousef, Ali Khamis, and unknown. Performance of Slow Sand Filters in Treating Secondary Effluent Using Different Sizes of Local Sand. 1990.

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