The sage encyclopedia of communication research methods. Los Angeles ; London ; New Delhi ; Singapore ; Washington DC ; Melbourne : Sage Reference, [2017]. ©2017. 1 online zdroj (xxxix, 1969 stran). Available on Internet: <https://ebookcentral.proquest.com/lib/ujep-ebooks/detail.action?docID=4841518> ISBN 978-1-4833-8145-9.