Cita APA (7a ed.)

Krohn, W. O. (1903). First book in hygiene: A primer of physiology.

Cita Chicago Style (17a ed.)

Krohn, William O. First Book in Hygiene: A Primer of Physiology. New York, 1903.

Cita MLA (9a ed.)

Krohn, William O. First Book in Hygiene: A Primer of Physiology. 1903.