POVOLNÁ, Renata. Some discourse markers used to express politeness in spoken academic discourse. In KUZNIAK, Marek a Bozena ROZWADOWSKA.
Studies in Language and Methodology of Teaching Foreign Languages, PASE Papers 2008. 1. vyd. Wroclaw: Oficyna Wydawnicza ATUT, Wroclaw 2009, 2009, s. 155-164. ISBN 978-83-7432-481-6.