Mode comparison study on willingness to buy and willingness to pay for organic foods: paper-and-pencil versus computerized questionnaire. - Kiriaki M. Keramitsoglou; Katja Lozar Manfreda; Charalampia Anastasiou; Knut Kalgraff Skjåk; Konstantinos P. Tsagarakis (Electron. Commer. Res., 2018)