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harvard.edu
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Dyson, F.W.; Eddington, A.S.; Davidson, C.R.: A Determination of the Deflection of Light by the Sun's Gravitational Field, from Observations Made at the Solar eclipse of May 29, 1919. Phil. Trans. Roy. Soc. A, 1920, 220. vsk, nro 571–581, s. 291–333. doi:10.1098/rsta.1920.0009. Bibcode:1920RSPTA.220..291D. (englanniksi)
William F. McComas: The Language of Science Education: An Expanded Glossary of Key Terms and Concepts in Science Teaching and Learning, s. 107. Springer Science & Business Media. ISBN 978-94-6209-497-0. Teoksen verkkoversio (viitattu 3.10.2016). (englanniksi)
stephenjaygould.org
Gould, Stephen Jay: Evolution as Fact and Theory. Discover, 1.5.1981, 2. vsk, nro 5, s. 34–37. Artikkelin verkkoversio. Viitattu 3.10.2016. (englanniksi)