Benjamin B. Wolman, « Iceland », dans International Directory of Psychology, Springer US, (ISBN978-1-4684-7253-0, lire en ligne), p. 104–104
« Aircraft Engines of the World.
1954 Edition. Paul H. Wilkinson. 320 pp. Illustrated. Published by Paul H. Wilkinson, New York. Pitman’s, London. 50s. », The Journal of the Royal Aeronautical Society, vol. 58, no 525, , p. 657–657 (ISSN0368-3931 et 2398-4600, DOI10.1017/s0368393100099740, lire en ligne, consulté le )
google.fr
books.google.fr
(en) Stanley S. McGowen, Helicopters: An Illustrated History of Their Impact, Bloomsbury Publishing USA, (ISBN978-1-85109-473-8, lire en ligne)
issn.org
portal.issn.org
« Aircraft Engines of the World.
1954 Edition. Paul H. Wilkinson. 320 pp. Illustrated. Published by Paul H. Wilkinson, New York. Pitman’s, London. 50s. », The Journal of the Royal Aeronautical Society, vol. 58, no 525, , p. 657–657 (ISSN0368-3931 et 2398-4600, DOI10.1017/s0368393100099740, lire en ligne, consulté le )