Ninh, Nguyen Thi Hai, et al. “Labor Division in Pig Farming Households: An Analysis of Gender and Economic Perspectives in the Red River Delta Vietnam”. International Journal of Economics and Financial Issues, vol. 9, no. 1, Jan. 2019, pp. 183-92, https://econjournals.com.tr/index.php/ijefi/article/view/7274.