AXUP, Jeff; VILLER, Stephen. Sampling mobile opinion: A contextual postcard questionnaire study. First Monday, [S. l.], v. 11, n. 9, 2006. DOI: 10.5210/fm.v11i9.1402. Disponível em: https://firstmonday.org/ojs/index.php/fm/article/view/1402. Acesso em: 28 mar. 2024.