Seligman, E. R., & Johnson, A. (1937). Encyclopaedia of the Social Sciences. MacMillan.
Tohutoru Kātū Chicago (17th ed.)Seligman, Edwin R., me Alvin Johnson. Encyclopaedia of the Social Sciences. Nueva York: MacMillan, 1937.
Tohutoro MLA (9th ed.)Seligman, Edwin R., me Alvin Johnson. Encyclopaedia of the Social Sciences. MacMillan, 1937.
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