Missionaries
| Alexander Gammie, Duncan Main of Hangchow. London: Pickering & Inglis, [1935]. Hbk. pp.159. | |
| Kingston de Gruchè, Doctor Apricot of "Heaven-Below". The Story of the Hangchow Medical Mission (C.M.S.). New York: Fleming H. Revell Company, [1910]. pp.144. |
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| Kingston de Gruchè, Dr. D. Duncan Main of Hangchow, Who is Known in China as Dr. Apricot of Heaven Below. 1930. | |
Christoffer H. Grundman, "Main, D(avid) Duncan," Gerald H. Anderson, ed., Biographical Dictionary of Christian Missions. Grand Rapids, MI: Cambridge, UK: Eerdmans, 1988. Pbk. ISBN: 0802846807. p.428. |