Small, Lyndon; Turnbull, S. Graeme; Fitch, Howard M. (1938). “THE ADDITION OF ORGANOMAGNESIUM HALIDES TO PSEUDOCODEINE TYPES. IV. NUCLEAR-SUBSTITUTED MORPHINE DERIVATIVES*”. The Journal of Organic Chemistry03 (3): 204–232. doi:10.1021/jo01220a003. ISSN0022-3263.
Small, Lyndon; Turnbull, S. Graeme; Fitch, Howard M. (1938). “THE ADDITION OF ORGANOMAGNESIUM HALIDES TO PSEUDOCODEINE TYPES. IV. NUCLEAR-SUBSTITUTED MORPHINE DERIVATIVES*”. The Journal of Organic Chemistry03 (3): 204–232. doi:10.1021/jo01220a003. ISSN0022-3263.