Huňak, James, a Petr Kolář. „HETEROGENEITY OF BUSINESS PASSENGERS IN AIR TRANSPORT". Perner’s Contacts 11, no. 4 (prosinec 30, 2016): 39–46. Viděno listopad 21, 2024. https://pernerscontacts.upce.cz/index.php/perner/article/view/568.