1. AASHE, 2020. Association for the advancement of sustainability in higher education. URL https://www.aashe.org/.
2. ACUPCC, 2012. Implementation guide version 2.1. American College & University presidents climate commitment.
3. ACUPCC, 2007a. American college and university president's climate commitment. URL https://secondnature.org/events/2007-acupcc-climate-leadership-summit/
4. Implementation Guide. Information and Resources for Participating Institutions,2007
5. Initial estimate of the carbon footprint of Qassim university, Saudi Arabia;Almufadi;Int. J. Appl. Eng. Res.,2016