Guo jia tong ji ju ren kou he jiu ye tong ji si bian = China population and employment statistics yearbook / compiled by Department of Population and Employment Statistics, National Bureau of Statistics of China
1971 census of Canada. Economic characteristics, labour force, industries = Recensement du Canada 1971. Volume 3, partie 4, Caractéristiques économiques, population active, activités économiques ; Bulletin 3.4-7