Romyen, L.; Swasthaisong, sanyasorn; Saenchat, P.; Muanglen, N.; Thanaraj, N.; Sawasthaisong, P. Development of vocational skills and community-based innovation to solve income poverty problems: The case study of Phon Na Kaeo District, Sakon Nakhon Province. RMUTSB-HUMAN 2025, 10, 97-112.