APA (7th ed.) Citation

Great Britain. General Register Office. (1961). Census 1961, England and Wales, preliminary report. H.M.S.O..

Chicago Style (17th ed.) Citation

Great Britain. General Register Office. Census 1961, England and Wales, Preliminary Report. London: H.M.S.O., 1961.

MLA (9th ed.) Citation

Great Britain. General Register Office. Census 1961, England and Wales, Preliminary Report. H.M.S.O., 1961.

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