ถีสูงเนิน ว. and สุขเสริม ธ. 2019. Leadership Styles Affecting an Employee Engagement: A Case Study in Swine Business of CPF (Thailand) Public Company Limited in Lower Northeastern Area. Journal of Graduate School, Pitchayatat, Ubon Ratchathani Rajabhat University. 14, 3 (Dec. 2019), 127–136.