Jimenez-Murcia S, Fernandez-Aranda F, Granero R, Choliz M, La Verde M, Aguglia E, Signorelli MS, Sa GM, Aymami N, Gomez-Pena M, del Pino-Gutierrez A, Moragas L, Fagundo AB, Sauchelli S, Fernandez-Formoso JA, Menchon JM. Video game addiction in gambling disorder: clinical, psychopathological, and personality correlates. Biomed Res Int. 2014;2014:315062. doi: 10.1155/2014/315062
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