Wardman M, Chintakayala PK, de Jong G. Values of travel time in Europe: review and meta-analysis. Transp Res Part A Policy Pract. 2016 Dec;94:93-111. doi: 10.1016/j.tra.2016.08.019
Dine JL, Schneider MK, Stewart BR, Armer JM. Learning from traditional healers in South Africa. J Lymphoedema. 2009;4(2):10-6.