Hayward, N. (1947). Graded general knowledge and intelligence tests (4th ed.). University Tutorial Press.
Citace podle Chicago (17th ed.)Hayward, N.C. Graded General Knowledge and Intelligence Tests. 4th ed. London: University Tutorial Press, 1947.
Citace podle MLA (9th ed.)Hayward, N.C. Graded General Knowledge and Intelligence Tests. 4th ed. University Tutorial Press, 1947.
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