Wan Zaimi, W.M.K.A. et al. 2013. Model Pengaturcaraan Linear untuk Meminimumkan Masa Menunggu Lebihan Penumpang Feri ke Pulau Langkawi: Linear Programming Model to Minimize the Waiting Times of Excess Ferry Passengers to Langkawi Island. Journal of Science and Mathematics Letters. 5, 1 (Dec. 2013), 35–46.