Hoa, Ho Thi Thu, et al. “Analysis of Technical efficiency’s Lettuce Farmers in Dalat City, Vietnam”. HO CHI MINH CITY OPEN UNIVERSITY JOURNAL OF SCIENCE - ECONOMICS AND BUSINESS ADMINISTRATION, vol. 14, no. 1, June 2023, pp. 38-49, doi:10.46223/HCMCOUJS.econ.en.14.1.2419.2023.