Willoughby, E. F. (1893). Handbook of public health and demography ([3d ed.].). Macmillan.
Lua i Stíl Chicago (17ú heag.)Willoughby, Edward F. Handbook of Public Health and Demography. [3d ed.]. London: Macmillan, 1893.
Lua MLA (8ú heag.)Willoughby, Edward F. Handbook of Public Health and Demography. [3d ed.]. Macmillan, 1893.
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