Cita APA (7a ed.)

Ehlers, V. M., & Steel, E. W. (1950). Municipal and rural sanitation (4th ed.). McGraw-Hill.

Cita Chicago Style (17a ed.)

Ehlers, Victor M., y Ernest W. Steel. Municipal and Rural Sanitation. 4th ed. New York: McGraw-Hill, 1950.

Cita MLA (8a ed.)

Ehlers, Victor M., y Ernest W. Steel. Municipal and Rural Sanitation. 4th ed. McGraw-Hill, 1950.