Manh Hung, Bui, et al. “COMMUNITY CHARACTERISTICS AND CONTRIBUTION LEVEL OF AGRO-FORESTRY ACTIVITIES ON INCOME OF HOUSEHOLDS IN BA VI COMMUNE, BA VI, HANOI”. Journal of Forestry Science and Technology, no. 5, Oct. 2018, pp. 015-2, https://journal.vnuf.edu.vn/en/article/view/900.