Northwestern University (Evanston, Ill.). (1918). John Harper Long, 1856-1918: Professor of chemistry in Northwestern University, 1881-1918. Northwestern University.
Παραπομπή σε μορφή Chicago (17η εκδ.)Northwestern University (Evanston, Ill.). John Harper Long, 1856-1918: Professor of Chemistry in Northwestern University, 1881-1918. [Evanston, Ill: Northwestern University, 1918.
Παραπομπή σε μορφή MLA (8th εκδ.)Northwestern University (Evanston, Ill.). John Harper Long, 1856-1918: Professor of Chemistry in Northwestern University, 1881-1918. Northwestern University, 1918.
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