ACKER, V. van; MOKHTARIAN, P. L.; WITLOX, F. Going soft: on how Subjective Variables Explain Modal Choices for Leisure Travel. European Journal of Transport and Infrastructure Research, [S. l.], v. 11, n. 2, 2011. DOI: 10.18757/ejtir.2011.11.2.2919. Disponível em: https://journals.open.tudelft.nl/ejtir/article/view/2919. Acesso em: 12 aug. 2022.