International Labor Office, Berthelot, M, International Labor Office, International Labor Office, International Labor Office, International Labor Office, . . . Lazard, M. (1975). Coal production in the Ruhr district (end of May 1920): Enquiry by the International Labour Office. Nendehln, Kraus Reprint.
Citação norma ChicagoInternational Labor Office, et al. Coal Production in the Ruhr District (end of May 1920): Enquiry by the International Labour Office. [Geneva]: Nendehln, Kraus Reprint, 1975.
Citação norma MLAInternational Labor Office, et al. Coal Production in the Ruhr District (end of May 1920): Enquiry by the International Labour Office. Nendehln, Kraus Reprint, 1975.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.