APA

Erskine E. B., . (1949). Hygiene and public health. New York: Prentice-Hall.

Chicago

Erskine Earl B, . 1949. Hygiene and public health. New York: Prentice-Hall.

Harvard

Erskine E. B., . (1949). Hygiene and public health. New York: Prentice-Hall.

MLA

Erskine Earl B, . Hygiene and public health. New York: Prentice-Hall. 1949.