Sinnott-Armstrong, W. (1996). Problems of Philosophy of Law (Update). In D. Borchert (Ed.), Encyclopedia of Philosophy, Supplement (pp. 414–416). New York: Macmillian.

Sinnott-Armstrong, W. “Problems of Philosophy of Law (Update).” In Encyclopedia of Philosophy, Supplement, edited by D. Borchert, 414–16. New York: Macmillian, 1996.

Sinnott-Armstrong W. Problems of Philosophy of Law (Update). In: Borchert D, editor. Encyclopedia of Philosophy, Supplement. New York: Macmillian; 1996. p. 414–6.

Sinnott-Armstrong, W. “Problems of Philosophy of Law (Update).” Encyclopedia of Philosophy, Supplement, edited by D. Borchert, Macmillian, 1996, pp. 414–16.

Sinnott-Armstrong W. Problems of Philosophy of Law (Update). In: Borchert D, editor. Encyclopedia of Philosophy, Supplement. New York: Macmillian; 1996. p. 414–416.