Persuasive Technology 13th International Conference, PERSUASIVE 2018, Waterloo, ON, Canada, April 18-19, 2018, Proceedings - Ham, Jaap; Ham, Jaap; Karapanos, Evangelos; Karapanos, Evangelos; Morita, Plinio P.; Morita, Plinio P.; Burns, Catherine M.; Burns, Catherine M. (Springer International Publishing : Imprint: Springer, 2018)