Rugg, H. O. (1917). Statistical methods applied to education: A textbook for students of education in the quantitative study of school problems. Houghton Mifflin Company.
Lua i Stíl Chicago (17ú heag.)Rugg, Harold Ordway. Statistical Methods Applied to Education: A Textbook for Students of Education in the Quantitative Study of School Problems. Boston, New York [etc.]: Houghton Mifflin Company, 1917.
Lua MLA (8ú heag.)Rugg, Harold Ordway. Statistical Methods Applied to Education: A Textbook for Students of Education in the Quantitative Study of School Problems. Houghton Mifflin Company, 1917.
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