McDonald, W. (1910). The principles of moral science: An essay (2d ed., rev. and enl.). M.H. Gill.
Lua i Stíl Chicago (17ú heag.)McDonald, Walter. The Principles of Moral Science: An Essay. 2d ed., rev. and enl. Dublin: M.H. Gill, 1910.
Lua MLA (8ú heag.)McDonald, Walter. The Principles of Moral Science: An Essay. 2d ed., rev. and enl. M.H. Gill, 1910.
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