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.
Citace podle Chicago (17th ed.)International 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.
Citace podle MLA (9th ed.)International Labor Office, et al. Coal Production in the Ruhr District (end of May 1920): Enquiry by the International Labour Office. Nendehln, Kraus Reprint, 1975.
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