APA Style

BERGER, P, L., Luckmann, T. (1991). The Social Construction of Reality; A Treatise in the Sociology of Knowledge . London: Penguin Books.

MLA Style

BERGER, PETER, L.., Luckmann, Thomas. "The Social Construction of Reality; A Treatise in the Sociology of Knowledge". London: Penguin Books, 1991. Text.