Citazione Stile APA (7a Edizione)

National Industrial Conference Board, Voskuil, W. H., & White, A. G. (1931). The competitive position of coal in the United States. National industrial conference board, inc..

Citazione stile Chigago Style (17a edizione)

National Industrial Conference Board, Walter H. Voskuil, e Alfred G. White. The Competitive Position of Coal in the United States. New York: National industrial conference board, inc., 1931.

Citatione MLA (8a ed.)

National Industrial Conference Board, et al. The Competitive Position of Coal in the United States. National industrial conference board, inc., 1931.