Sinnott-Armstrong, W. (2001). Gert, Bernard. In L. Becker & C. Becker (Eds.), Encyclopedia of Ethics (Vol. 1, pp. 608–610). London & New York: Routledge.

Sinnott-Armstrong, W. “Gert, Bernard.” In Encyclopedia of Ethics, edited by L. Becker and C. Becker, 1:608–10. London & New York: Routledge, 2001.

Sinnott-Armstrong W. Gert, Bernard. In: Becker L, Becker C, editors. Encyclopedia of Ethics. London & New York: Routledge; 2001. p. 608–10.

Sinnott-Armstrong, W. “Gert, Bernard.” Encyclopedia of Ethics, edited by L. Becker and C. Becker, vol. 1, Routledge, 2001, pp. 608–10.

Sinnott-Armstrong W. Gert, Bernard. In: Becker L, Becker C, editors. Encyclopedia of Ethics. London & New York: Routledge; 2001. p. 608–610.