Gudono, G. “The Application of Choice-Based Conjoint Model to Study Government Authorities Preference: A Case of Traffic-Subsidy-Pollution Related Policy in Indonesia”. Gadjah Mada International Journal of Business, Vol. 12, no. 3, Sept. 2010, pp. 377-91, https://jurnal.ugm.ac.id/v3/gamaijb/article/view/15279.