Tohutoro APA (7th ed.)
Phelps, E. B., & Velz, C. J. Public health engineering: A textbook of the principles of environmental sanitation. Wiley.
Tohutoru Kātū Chicago (17th ed.)
Phelps, Earle B., me Clarence J. Velz. Public Health Engineering: A Textbook of the Principles of Environmental Sanitation. Nueva York, EUA: Wiley.
Tohutoro MLA (9th ed.)
Phelps, Earle B., me Clarence J. Velz. Public Health Engineering: A Textbook of the Principles of Environmental Sanitation. Wiley.
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