Matanock A, Lu X, Derado G, Cuellar VM, Juliao P, Alvarez M, Lopez B, Munoz F, Thornton A, Patel JC, Lopez G, Reyes L, Arvelo W, Blackstock AJ, Lindblade KA, Roy SL. Association of water quality with soil-transmitted helminthiasis and diarrhea in Nueva Santa Rosa, Guatemala, 2010. J Water Health. 2018 Oct;16(5):724-36. doi: 10.2166/wh.2018.207
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
Pattanayak SK, Poulos C, Yang JC, Patil SR, Wendland KJ. Of taps and toilets: quasi-experimental protocol for evaluating community-demand-driven projects. J Water Health. 2009 Sep 1;7(3):434-51.