MacKay RE, Gross JM, Hepburn KW, Spangler SA, ARC Study Group. Nurse- and midwife-led HIV services in Eastern and Southern Africa: challenges and opportunities for health facilities. J Assoc Nurse Aids C. 2020 Jul;31(4):392-404. doi: 10.1097/JNC.0000000000000176
Edwards PET, Parsons GR, Myers KH. The economic value of viewing migratory shorebirds on the Delaware Bay: an application of the single-site travel cost model using on-site data. Hum Dimens Wildl. 2011;16(6):435-44. doi: 10.1080/10871209.2011.608180