1. Business Administration, Universitas Diponegoro, Semarang, Indonesia
2. Faculty of Social Science and Political Science, Universitas Diponegoro, Semarang, Indonesia
3. Faculty of Forestry, Mulawarman University, Kalimantan Timur, Indonesia
4. Communication Studies, Universitas Negeri Yogyakarta, Yogyakarta, Indonesia
5. Management, Universitas Ciputra Surabaya, Surabaya, Indonesia