Source references

  1. Thüne, Sabine: Auf den Spuren von Ernst Jakob Christoffel. Ein Lebensbild mit Selbstzeugnissen und Bilddokumenten. Herausgegeben von der Christoffel-Blindenmission. ISBN: 3000055479 (ISBN-13: 9783000055478)
  2. Thüne, Sabine (Hrsg) Ernst Jakob Christoffel – Ein Leben im Dienst Jesu. Nürnberg, VTR, 2007. ISBN: 9783937965390
  3. Burial site
  4. Integrated, people-centred eye care, including preventable blindness and impaired vision. WHO Executive Board, 146th session; provisional agenda item 12, December 9, 2019.
  5. World Report on Vision; World Health Organisation 2019. ISBN 978-92-4-151657-0 (accessed May 4, 2021)
  6. Thylefors B. WHO program for the prevention of blindness. Int Opthalmol1990: 14: 211
  7. (accessed May 5, 2021)

Picture references

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