RCS Index to PhotographersArchived 5 March 2012 at the Wayback Machine, Cambridge University Library. Note: The Royal Commonwealth Society Photographers Index database at Cambridge University lists them as in the 1880s and 1890s.
C. & G. Zangaki Photographs Collection, 1870–1875, Princeton University Library Finding Aids. Note: The Zangaki Collection Finding Aid at Princeton University lists them as functioning from 1870 to 1875
RCS Index to PhotographersArchived 5 March 2012 at the Wayback Machine, Cambridge University Library. Note: The Royal Commonwealth Society Photographers Index database at Cambridge University lists them as in the 1880s and 1890s.
