Não informado. (1987). Nature, Society and Thought. Marxist Educational Press.
Chicago-referens (17:e uppl.)Não informado. Nature, Society and Thought. Minneapolis, Minn: Marxist Educational Press, 1987.
MLA-referens (8:e uppl.)Não informado. Nature, Society and Thought. Marxist Educational Press, 1987.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.