before industrialization (Stockholm 1992). Wallons de Suède Forge wallonne Awty, Brian G. 'The Development and Dissemination of the Walloon Method of Ironworking'
(ISBN 978-0814755204), p.71 (en) Peter F. Sugar, Industrializationof Bosnia-Hercegovina: 1878-1918, University of Washington Press, 1963 (ISBN 978-0295738147)