APA (7th ed.) Citation

Lloyd, B., & Helmer, R. (1991). Surveillance of drinking water quality in rural areas. Longman Scientific & Technical ; Wiley.

Chicago Style (17th ed.) Citation

Lloyd, Barry, and Richard Helmer. Surveillance of Drinking Water Quality in Rural Areas. Burnt Mill, Harlow, Essex, England : New York: Longman Scientific & Technical ; Wiley, 1991.

MLA (9th ed.) Citation

Lloyd, Barry, and Richard Helmer. Surveillance of Drinking Water Quality in Rural Areas. Longman Scientific & Technical ; Wiley, 1991.