Impact of cropping system, price and convenience on the willingness to purchase lettuce - Rizzo, Denise Lutgens; De Carli, André Augusto; Kushida, Marta Mitsui; Fávaro-Trindade, Carmen Silvia; Lapa-Guimarães, Judite das Graças (Pangborn Sensory Science Symposium, 2013)