O'Connor, Peter. Evaluating electronic channels of distribution in the hotel sector: a Delphi study / Peter O'Connor, Andrew J. Frew. - 2000. // Information technology & tourism : applications, methodologies, techniques. Vol. 3 (2000), No. 3-4
Xiang, Zheng. Online competitive information space for hotels: an information search perspective / Zheng Xiang, Rob Law. - 2013. // Journal of hospitality marketing & management. Vol. 22 (2013), No. 5-6