Não informado. (1918). Monthly Labor Review. Department of Labour, Bureau of Labor Statistics.
Chicago (17e ed.) BronvermeldingNão informado. Monthly Labor Review. Washington: Department of Labour, Bureau of Labor Statistics, 1918.
MLA (8e ed.) BronvermeldingNão informado. Monthly Labor Review. Department of Labour, Bureau of Labor Statistics, 1918.
Let op: Deze citaties zijn niet altijd 100% accuraat.