Baidoo, I. K., E. Nyarko, K. Doku-Amponsah, E. N. N. Nortey, and F. O. Mettle. “PREFERENCE HETEROGENEITY IN COMMERCIAL VEHICLE PASSENGER CHOICE: A DISCRETE CHOICE EXPERIMENT”. European Scientific Journal, ESJ, Vol. 11, no. 27, Sept. 2015, https://eujournal.org/index.php/esj/article/view/6264.