Williamson, R. (1993). To meet early adolescent needs. National Association of Secondary School Principals.
Citace podle Chicago (17th ed.)Williamson, Ronald. To Meet Early Adolescent Needs. Reston: National Association of Secondary School Principals, 1993.
Citace podle MLA (9th ed.)Williamson, Ronald. To Meet Early Adolescent Needs. National Association of Secondary School Principals, 1993.
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