Sinnott-Armstrong, W. (1992). Moral Dilemmas. In L. Becker & C. Becker (Eds.), Encyclopedia of Ethics (Vol. 2, pp. 835–837). New York & London: Garland Publishing Co.

Sinnott-Armstrong, W. “Moral Dilemmas.” In Encyclopedia of Ethics, edited by L. Becker and C. Becker, 2:835–37. New York & London: Garland Publishing Co., 1992.

Sinnott-Armstrong W. Moral Dilemmas. In: Becker L, Becker C, editors. Encyclopedia of Ethics. New York & London: Garland Publishing Co.; 1992. p. 835–7.

Sinnott-Armstrong, W. “Moral Dilemmas.” Encyclopedia of Ethics, edited by L. Becker and C. Becker, vol. 2, Garland Publishing Co., 1992, pp. 835–37.

Sinnott-Armstrong W. Moral Dilemmas. In: Becker L, Becker C, editors. Encyclopedia of Ethics. New York & London: Garland Publishing Co.; 1992. p. 835–837.