Dyfyniad APA

Willoughby, E. F. (1893). Handbook of public health and demography ([3d ed.].). Macmillan.

Dyfyniad Arddull Chicago

Willoughby, Edward F. Handbook of Public Health and Demography. [3d ed.]. London: Macmillan, 1893.

Dyfyniad MLA

Willoughby, Edward F. Handbook of Public Health and Demography. [3d ed.]. Macmillan, 1893.

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