Rujukan Frei_Otto

  1. 1 2 Pritzker Prize for Frei Otto, German Architect, Announced After His Death, Robin Pogrebin, The New York Times, 10 March 2015
  2. ↑ Cramer, James P.; Yankopolus, Jennifer Evans (2005). Almanac of Architecture & Design 2006.
    Greenway Communications,. m/s. 720. ISBN 9780975565421.Selenggaraan CS1: tanda baca ekstra (link)
  3. 1 2 Barnes, Michael; DIckson, Michael (1 November 2000). Widespan Roof Structures. ICE Publishing. m/s. 19. ISBN 978-0727728777.
  4. ↑ The man with the golden pen, Building.co.uk, 2005 issue 08
  5. ↑ "Frei Otto". Praemium Imperiale. Dicapai pada 11 March 2015.
  6. ↑ "Frei Otto, 2015 Laureate". Pritzker Architecture Prize. 10 March 2015. Dicapai pada 11 March 2015.