Ayres, L. P. (1909). Laggards in our schools: A study of retardation and elimination in city school systems. Charities publication committee.
Citace podle Chicago (17th ed.)Ayres, Leonard Porter. Laggards in Our Schools: A Study of Retardation and Elimination in City School Systems. New York: Charities publication committee, 1909.
Citace podle MLA (8th ed.)Ayres, Leonard Porter. Laggards in Our Schools: A Study of Retardation and Elimination in City School Systems. Charities publication committee, 1909.
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