Mawanga, F. F. . “Forecasting Prices of Charcoal As Source of Cooking Energy Using Sarima Modelling: Evidence from A Developing Country”. Operations Research Society of Eastern Africa, vol. 6, no. 2, Dec. 2016, pp. 91-117, https://orseajournal.udsm.ac.tz/index.php/orsea/article/view/54.