Entrepreneurship and management. International conference on applied economics contemporary issues in economy. Quantitative methods : proceedings of the [9th] international conference on applied economics contemporary issues in economy : [22-23 june 2017], Toruń, Poland. Reviewing committee: Paweł Baranowski ... [et al.]. 1st ed. Toruń : Institute of Economic Research, 2017. online [477 s.]. ISBN 978-83-65605-08-5. ISSN 2544-2384.