1.		Canada 1975 : The annual Hadbook of presente conditions and recent progress / Authority of the Minister of Industry, Trade and Commerce Data Publicação: 1974
2.		Canada 1975 : The annual Hadbook of presente conditions and recent progress / Authority of the Minister of Industry, Trade and Commerce Data Publicação: 1974
3.		Canada1946 : The Official Hadbook of Presente Conditions and Recent Progress / Departement of Trade and Commerce Data Publicação: 1946