APA استشهاد

Posner, R. A. (1993). The problems of jurisprudence. Universal.

استشهاد بنمط شيكاغو

Posner, Richard A. The Problems of Jurisprudence. N.Delhi: Universal, 1993.

MLA استشهاد

Posner, Richard A. The Problems of Jurisprudence. Universal, 1993.