Tham khảo Utopia

  1. 1 2 Lyman Tower, Sargent (2005). Rüsen, Jörn; Fehr, Michael; Reiger, Thomas W., biên tập. The Necessity of Utopian Thinking: A Cross-National Perspective. Thinking Utopia: Steps Into Other Worlds (Bản báo cáo) (bằng tiếng Anh) (New York, USA: Berghahn Books): 11. ISBN 9781571814401. 
  2. ↑ Lodder, C.; Kokkori, M; Mileeva, M (2013). Utopian Reality: Reconstructing Culture in Revolutionary Russia and Beyond (bằng tiếng Anh). Leiden, The Netherlands: Koninklijke Brill NV. tr. 1–9. ISBN 9789004263208. 
  3. ↑ Kirk, Andrew G. (2007). Counterculture green: the Whole earth catalog and American environmentalism. University Press of Kansas. p. 86. ISBN 978-0-7006-1545-2.
  4. ↑ Geus, Marius de (1996). Ecologische utopieën- Ecotopia's en het milieudebat. Uitgeverij Jan van Arkel.