1. Adi, A. (2019). PR2025: Trends, competencies, and solutions for PR/Communications. Quadriga University. https://www.quadriga-university.com/sites/default/files/document/2019-06/PR2025_Adi.pdf. Accessed 3 July 2020.
2. AMEC – International Association for the Measurement and Evaluation of Communication. (2020, July). Barcelona principles 3.0. Retrieved September 28, 2020, from https://amecorg.com/2020/07/barcelona-principles-3-0/
3. Comcowich, W. (2018). Lobbyists beware: PR emerges as the new lobbying. Retrieved September 27, 2020, from https://glean.info/lobbyists-beware-pr-emerges-new-lobbying
4. Department for International Development of the United Kingdom. (2010). Guidance on the Government’s marketing, advertising and communications spending controls for research programmes. https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/285923/spending-control-guidance-research-progs.pdf. Accessed 3 Aug 2020.
5. Duffin, E. (2020, March 4). Leading lobbying industries in the United States in 2019, by total lobbying spending (in million U.S. dollars). https://www.statista.com/statistics/257364/top-lobbying-industries-in-the-us/ Accessed 2 Aug 2020.