APA (7th ed.) Citation

Sierra, A. L. (1999). Color removal in wastewater using attapulgite clay.

Chicago Style (17th ed.) Citation

Sierra, Antonio L. Color Removal in Wastewater Using Attapulgite Clay. 1999.

MLA (9th ed.) Citation

Sierra, Antonio L. Color Removal in Wastewater Using Attapulgite Clay. 1999.

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