THILL, John V. - BOVÉE, Courtland L. Excellence in business communication. Twelfth edition. Boston : Pearson, [2017]. ©2017. 1 online zdroj (671 stran). Dostupné na internetu: <https://ebookcentral.proquest.com/lib/ujep-ebooks/reader.action?docID=5186014&ppg=1> ISBN 978-1-292-15665-1.