APA (7th ed.) Citation

South Africa. Office of Census and Statistics. (1918). Official year book of the Union.

Chicago Style (17th ed.) Citation

South Africa. Office of Census and Statistics. Official Year Book of the Union. Pretoria : Govt. Print. and Stationery Office, 1918.

MLA (8th ed.) Citation

South Africa. Office of Census and Statistics. Official Year Book of the Union. 1918.

Warning: These citations may not always be 100% accurate.