Michael Polanyi, Personal Knowledge: Towards a Post-Critical Philosophy, ISBN 0226672883, footnote page 10-11: Einstein reports, via Dr N Balzas in response to Polanyi's query, that "The Michelson–Morely experiment had no role in the foundation of the theory." and "..the theory of relativity was not founded to explain its outcome at all."[2](engelska)
Dalibor Brozović & Tomislav Ladan, Hrvatska enciklopedija, lexikografiska institutet Miroslav Krleža, 1999, Hrvatska enciklopedija-ID: 41971.[källa från Wikidata]