Koos, L. V. (1934). National Survey of Secondary Education. Bulletin, 1932, No. 17. Monograph No. 1: Summary.
Citazione stile Chigago Style (17a edizione)Koos, Leonard V. National Survey of Secondary Education. Bulletin, 1932, No. 17. Monograph No. 1: Summary. 1934.
Citatione MLA (9a ed.)Koos, Leonard V. National Survey of Secondary Education. Bulletin, 1932, No. 17. Monograph No. 1: Summary. 1934.
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