Muhammad Waqas, Muqaddas Rehman, Abdul Rehman 2023. The Barriers and Challenges Faced by Private Sector Higher Education Institutions (HEIs) in Promoting Sustainable Development: A Qualitative Inquiry in Pakistan . PJE. 36, 1 (May 2023). DOI:https://doi.org/10.30971/pje.v36i1.999.