APA (7th ed.) Citation

Billings, M. L. (1941). Group methods of studying occupations (2d ed.). International textbook company.

Chicago Style (17th ed.) Citation

Billings, Mildred Lincoln. Group Methods of Studying Occupations. 2d ed. Scranton, Pa.: International textbook company, 1941.

MLA (9th ed.) Citation

Billings, Mildred Lincoln. Group Methods of Studying Occupations. 2d ed. International textbook company, 1941.