AMBRUŠOVÁ, Lucia - MARTTILA, Juhani. Comparison of outsourced operations in wood procurement in Finland and Slovakia [online]. Rec. Timo Karjalainen. Vantaa : Finnish Forest Research Institute, 2012. 22 p. Working Papers of the Finnish Forest Research Institute, 249. Dostupné na internete: <http://www.metla.fi/julkaisut/workingpapers/2012/mwp249.pdf> ISBN 978-951-40-2400-9. ISSN 1795-150X.