APA (7e ed.) Bronvermelding

Judkins, C. J. (1942). Trade and professional associations of the United States. U.S. Govt. Print. Off.

Chicago (17e ed.) Bronvermelding

Judkins, Calvert Jay. Trade and Professional Associations of the United States. Washington: U.S. Govt. Print. Off, 1942.

MLA (9e ed.) Bronvermelding

Judkins, Calvert Jay. Trade and Professional Associations of the United States. U.S. Govt. Print. Off, 1942.