Sinnott-Armstrong, W. (1992). Intuitionism. In L. Becker & C. Becker (Eds.), Encyclopedia of Ethics (Vol. 1, pp. 628–630). New York & London: Garland Publishing Co.

Sinnott-Armstrong, W. “Intuitionism.” In Encyclopedia of Ethics, edited by L. Becker and C. Becker, 1:628–30. New York & London: Garland Publishing Co., 1992.

Sinnott-Armstrong W. Intuitionism. In: Becker L, Becker C, editors. Encyclopedia of Ethics. New York & London: Garland Publishing Co.; 1992. p. 628–30.

Sinnott-Armstrong, W. “Intuitionism.” Encyclopedia of Ethics, edited by L. Becker and C. Becker, vol. 1, Garland Publishing Co., 1992, pp. 628–30.

Sinnott-Armstrong W. Intuitionism. In: Becker L, Becker C, editors. Encyclopedia of Ethics. New York & London: Garland Publishing Co.; 1992. p. 628–630.