Michael J. Sweet, Desperately Seeking Capuchins: Manoel Freyre's Report on the Tibetans and Their Routes (Tibetorum ac eorum Relatio Viarum) and the Desideri Mission to Tibet, Journal of the International Association of Tibetan Studies, vol. 2 (Autumn 2006), in 33 pages (freely available over the internet).
"Emmanuel Freyre." E.H. Parker, The Preaching of the Gospel in Tibet, The China Review, vol. 18, no. 5 (March 1890), pp. 279-284, at p. 280.
