Manske, R. H. F.; Johnson, T. B. (1929). „Synthesis of Ephedrine and Structurally Similar Compounds. I. A New Synthesis of Ephedrine”. Journal of the American Chemical Society. 51 (2): 580—582. Bibcode:1929JAChS..51..580M. doi:10.1021/ja01377a032.
Manske, R. H. F.; Johnson, T. B. (1929). „Synthesis of Ephedrine and Structurally Similar Compounds. I. A New Synthesis of Ephedrine”. Journal of the American Chemical Society. 51 (2): 580—582. Bibcode:1929JAChS..51..580M. doi:10.1021/ja01377a032.