QuiN. H., GuntoroB., and SyahlaniS. P. “The Social Profile, Constraints, and Its Impact on Swine Herd Size in Tra Vinh Province, Vietnam”. Tropical Animal Science Journal, Vol. 43, no. 4, Dec. 2020, pp. 385-90, doi:10.5398/tasj.2020.43.4.385.