Helbing, H. (1891). Modern materia medica: For pharmacists, medical men, and students (2nd enl. ed.). The British & Colonial Druggist.
Lua i Stíl Chicago (17ú heag.)Helbing, H. Modern Materia Medica: For Pharmacists, Medical Men, and Students. 2nd enl. ed. London: The British & Colonial Druggist, 1891.
Lua MLA (8ú heag.)Helbing, H. Modern Materia Medica: For Pharmacists, Medical Men, and Students. 2nd enl. ed. The British & Colonial Druggist, 1891.
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