Triatun, T., & Sukidjo, S. (2021). Influence of personality, attitude, motivation, and environment on the entrepreneurial spirit of school cooperative teachers in vocational schools in Kulon Progo regency. Harmoni Sosial: Jurnal Pendidikan IPS, 8(1), 45–56. https://doi.org/10.21831/hsjpi.v8i1.16439