Cita APA (7th ed.)
Dale, A., & Hill, S. B. (2001). At the edge: Sustainable development in the 21st century. UBC Press.
Cita Chicago (17th ed.)
Dale, Ann, i Stuart B. Hill. At the Edge: Sustainable Development in the 21st Century. Vancouver: UBC Press, 2001.
Cita MLA (9th ed.)
Dale, Ann, i Stuart B. Hill. At the Edge: Sustainable Development in the 21st Century. UBC Press, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.