Seligman, E. (1963). Encyclopaedia of the social sciences-Gos-Lab Vol. VII & VIII. The Macmillan Co.
Lua i Stíl Chicago (17ú heag.)Seligman, E. Encyclopaedia of the Social Sciences-Gos-Lab Vol. VII & VIII. New York: The Macmillan Co, 1963.
Lua MLA (9ú heag.)Seligman, E. Encyclopaedia of the Social Sciences-Gos-Lab Vol. VII & VIII. The Macmillan Co, 1963.
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