MLA

Clapham, John, et al. Trade and Industry In the Middle Ages. Cambridge: Cambridge University press, 1952.

APA

Clapham, J., Postan, M. M, Power, E. Edna le Poer, & Rich, E. E. (1952). Trade and industry in the Middle Ages. Cambridge: Cambridge University press.

Chicago

Clapham, John, and Eileen Edna le Poer Power. Trade and Industry In the Middle Ages. Edited by M. M Postan and E. E Rich. Cambridge: Cambridge University press, 1952.