Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Stanley T. Asah and Miku M. Lenentine and Dale J. Blahna,Benefits of urban landscape eco-volunteerism: Mixed methods segmentation analysis and implications for volunteer retention,Landscape and Urban Planning,0169-2046,Elsevier BV,2014-03,123,,108-113,https://cir.nii.ac.jp/crid/1362262943663254784,https://doi.org/10.1016/j.landurbplan.2013.12.011