Seligman, E. (1963). Encyclopaedia of the social sciences-Pur-TRa Vol. XIII & XIV. Ther Macmillan Co.
Lua i Stíl Chicago (17ú heag.)Seligman, E. Encyclopaedia of the Social Sciences-Pur-TRa Vol. XIII & XIV. New York: Ther Macmillan Co, 1963.
Lua MLA (9ú heag.)Seligman, E. Encyclopaedia of the Social Sciences-Pur-TRa Vol. XIII & XIV. Ther Macmillan Co, 1963.
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