Tohutoro APA (7th ed.)
Hellmich, E. W. (1937). The Mathematics in certain elementary social studies in secondary schools and colleges. Teachers College, Columbia Univ.
Tohutoru Kātū Chicago (17th ed.)
Hellmich, Eugene W. The Mathematics in Certain Elementary Social Studies in Secondary Schools and Colleges. New York: Teachers College, Columbia Univ, 1937.
Tohutoro MLA (9th ed.)
Hellmich, Eugene W. The Mathematics in Certain Elementary Social Studies in Secondary Schools and Colleges. Teachers College, Columbia Univ, 1937.
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