Parkes, L. C., & Kenwood, H. R. (1923). Hygiene and public health: By Louis C. Parkes and Henry R. Kenwood (7th ed.). Blakiston.
Lua i Stíl Chicago (17ú heag.)Parkes, Louis Coltman, agus Henry R. Kenwood. Hygiene and Public Health: By Louis C. Parkes and Henry R. Kenwood. 7th ed. Philadelphia: Blakiston, 1923.
Lua MLA (8ú heag.)Parkes, Louis Coltman, agus Henry R. Kenwood. Hygiene and Public Health: By Louis C. Parkes and Henry R. Kenwood. 7th ed. Blakiston, 1923.
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