Tohutoro APA (7th ed.)
Engel, L. Medicine Makers of Kalamazoo. McGraw-Hill.
Tohutoru Kātū Chicago (17th ed.)
Engel, Leonard. Medicine Makers of Kalamazoo. Nueva York, EUA: McGraw-Hill.
Tohutoro MLA (9th ed.)
Engel, Leonard. Medicine Makers of Kalamazoo. McGraw-Hill.
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