APA (7th ed.) Citation

Block, T. J., Rogacki, L., & Voigt, C. (2008). No chemicals required. Water Environment & Technology, 20(1), 42.

Chicago Style (17th ed.) Citation

Block, Timothy J., Larry Rogacki, and Christine Voigt. "No Chemicals Required." Water Environment & Technology 20, no. 1 (2008): 42.

MLA (9th ed.) Citation

Block, Timothy J., et al. "No Chemicals Required." Water Environment & Technology, vol. 20, no. 1, 2008, p. 42.