Trân, Thi Liên (2005). "The Catholic Question in North Vietnam: From Polish Sources, 1954–56". Cold War History. London: Routledge. 5 (4): 427–449. doi:10.1080/14682740500284747.
Hammer, Ellen J. "The Bao Dai Experiment." Pacific Affairs, vol. 23, no. 1, Pacific Affairs, University of British Columbia, 1950, p. 55, doi:10.2307/2753754.