HUTCHINS, R. M. [. (1989). Great books of the western world vol.50: Marx Engels. Encyclopaedia Britannica.
Lua i Stíl Chicago (17ú heag.)HUTCHINS, Robert Maynard [Ed.]. Great Books of the Western World Vol.50: Marx Engels. Chicago: Encyclopaedia Britannica, 1989.
Lua MLA (9ú heag.)HUTCHINS, Robert Maynard [Ed.]. Great Books of the Western World Vol.50: Marx Engels. Encyclopaedia Britannica, 1989.
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