KELLERMAN, Aharon. Geographic interpretations of the internet. [Cham], Switzerland : Springer Nature, [2016]. ©2016. 1 online zdroj (xv, 121 stran). SpringerBriefs in geography. Dostupné na internetu: <https://ebookcentral.proquest.com/lib/ujep-ebooks/reader.action?docID=4514498&ppg=1> ISBN 978-3-319-33804-0.