United Nations. Secretariat. Statistical Office. Statistical Year Book 1971. New York : Publishing Service, United Nations, 1976, p. 66.
2.
United States Civil Administration of the Ryukyu Islands.Civil Affairs Activities in the Ryukyu Islands. Vol. III, No. 2, 1956, pp. 219–221.
3.
BryanEdwin H.Jr. “Okinawa,” World Book Encylopedia. Vol. 14, 1964, pp. 540–541.
4.
KerrGeorge H.Okinawa: The History of an Island People. Tokyo : Charles E. Tuttle Company, 1958, p. 158.
5.
Bryan, op. cit., pp. 540–541.
6.
Unofficial figure given by a United States official in August, 1971.
7.
HigaMisako. Rural Houses in Terms of Family Living before and after 1945 in the Ryukyu Islands, Unpublished Doctoral dissertation. University of Minnesota, 1971, pp. 238–241.