De Sitter, W. (1911). “On the bearing of the Principle of Relativity on Gravitational Astronomy”. Monthly Notices of the Royal Astronomical Society71 (5): 388–415. doi:10.1093/mnras/71.5.388. hdl:2027/mdp.39015019246357.
De Sitter, W. (1913). “A proof of the constancy of the velocity of light”. Proceedings of the Royal Netherlands Academy of Arts and Sciences15 (II): 1297–1298. Bibcode: 1913KNAB...15.1297D.
“Ein astronomischer Beweis für die Konstanz der Lichtgeschwindigkeit [An astronomical proof of the constancy of the speed of light]”. Physikalische Zeitschrift14: 429. (1913).
“On the constancy of the velocity of light”. Proceedings of the Royal Netherlands Academy of Arts and Sciences16 (I): 395–396. (1913).
De Sitter, W. (1913). “Über die Genauigkeit, innerhalb welcher die Unabhängigkeit der Lichtgeschwindigkeit von der Bewegung der Quelle behauptet werden kann [On the accuracy within which the independence of the speed of light from the motion of the source can be asserted]”. Physikalische Zeitschrift14: 1267. Bibcode: 1913PhyZ...14.1267D.
アインシュタインの重力理論とその天文学的帰結について
de Sitter, W. (1916-07-14). “On Einstein's Theory of Gravitation and its Astronomical Consequences. First Paper” (英語). Monthly Notices of the Royal Astronomical Society76 (9): 699–728. Bibcode: 1916MNRAS..76..699D. doi:10.1093/mnras/76.9.699. ISSN 0035-8711. https://academic.oup.com/mnras/article/76/9/699/1027501.
de Sitter, W. (1916-12-08). “On Einstein's Theory of Gravitation and its Astronomical Consequences. Second Paper.” (英語). Monthly Notices of the Royal Astronomical Society77 (2): 155–184. Bibcode: 1916MNRAS..77..155D. doi:10.1093/mnras/77.2.155. ISSN 0035-8711. https://academic.oup.com/mnras/article/77/2/155/979347.
de Sitter, W. (1917-11-09). “On Einstein's Theory of Gravitation and its Astronomical Consequences. Third Paper.” (英語). Monthly Notices of the Royal Astronomical Society78 (1): 3–28. Bibcode: 1917MNRAS..78....3D. doi:10.1093/mnras/78.1.3. ISSN 0035-8711. https://academic.oup.com/mnras/article/78/1/3/1239878.
O'Connor, John J.; Robertson, Edmund F., “ウィレム・ド・ジッター”, MacTutor History of Mathematics archive, University of St Andrews, https://mathshistory.st-andrews.ac.uk/Biographies/Sitter/.
P.C. van der Kruit Willem de Sitter (1872 – 1934) in: History of science and scholarship in the Netherlands.
A. Blaauw, Sitter, Willem de (1872–1934), in Biografisch Woordenboek van Nederland.
Bruce Medal page
Awarding of Bruce Medal: PASP 43 (1931) 125
Awarding of RAS gold medal: MNRAS 91 (1931) 422
de Sitter's binary star arguments against Ritz's relativity theory (1913) (four articles)