Tohutoro APA (7th ed.)
Heltzel, V. E. (1950). Northwestern University studies: Humanities series. Northwestern Univ. Press.
Tohutoru Kātū Chicago (17th ed.)
Heltzel, Virgil E. Northwestern University Studies: Humanities Series. Evanston: Northwestern Univ. Press, 1950.
Tohutoro MLA (9th ed.)
Heltzel, Virgil E. Northwestern University Studies: Humanities Series. Northwestern Univ. Press, 1950.
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