Sinh, Nguyen Hoang. “Factors Affecting Botanic Park Visitation: A Case of Saigon Zoo and Botanical Gardens”. Ho Chi Minh City Open University Journal of Science - Economics and Business Administration, vol. 3, no. 1, Aug. 2013, pp. 113-2, doi:10.46223/HCMCOUJS.econ.en.3.1.107.2013.