Schonell, F. J. (1942). Diagnosis of individual difficulties in arithmetic (2nd ed. (rev.).). Oliver and Boyd.
Citace podle Chicago (17th ed.)Schonell, Fred J. Diagnosis of Individual Difficulties in Arithmetic. 2nd ed. (rev.). Edinburgh: Oliver and Boyd, 1942.
Citace podle MLA (8th ed.)Schonell, Fred J. Diagnosis of Individual Difficulties in Arithmetic. 2nd ed. (rev.). Oliver and Boyd, 1942.
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