Peter Freuchen, 1961, Book of The skimos Newyork: Fawcett.
Herodotus 1972, The Histories, translated by Aubrey de selincourt, revised by A.R.Burn, Harmondsworth, Middleses: penguin Books.
Newyork Times (mainly by Celia W.Dugger) Published in 1996 on April 15, April 25, May 2, May 3, July 8, September 11, october 5, october 12, and December 28.
Charles L. Stevenson, 1994, Ethics and Language, Newyork: YaleUniversity press.
* این مقاله ترجمه فصل 2 و 3 از کتاب زیر است:
James Rachels, 1999, The Elements of Moral Philosophy, MC Graw-Hill college.