APA (7th ed.) Citation

Ahmed, S., & unknown. (1987). Tertiary wastewater treatment by sedimantation and sand filtration.

Chicago Style (17th ed.) Citation

Ahmed, Suhail, and unknown. Tertiary Wastewater Treatment by Sedimantation and Sand Filtration. 1987.

MLA (9th ed.) Citation

Ahmed, Suhail, and unknown. Tertiary Wastewater Treatment by Sedimantation and Sand Filtration. 1987.

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