MLA

Habakkuk, H. J, and M. M Postan. The Agrarian Life of the Middle Ages. 2nd ed. Cambridge: Cambridge University Press, 1966.

APA

Habakkuk, H. J, & Postan, M. M. (1966). The agrarian life of the Middle Ages. 2nd ed. Cambridge: Cambridge University Press.

Chicago

Habakkuk, H. J. ed., and M. M Postan ed. The Agrarian Life of the Middle Ages. 2nd ed. Cambridge: Cambridge University Press, 1966.