↑ Savani, A. M. Visage et Images du Sud-Viet-Nam. Saigon: Imprimerie Françcaise d'Outre-mer, 1955. tr 245
↑ United Nations. Department of Economic and Social Affairs. Statistical Office of the United Nations. World Weights and Measures. Handbook for Statisticians. Statistical Papers. Series M no. 21 Revision 1. (ST/STAT/SER.M/21/rev.1), New York: United Nations, 1966.
