Kennefick, Daniel (2019). No shadow of a doubt: the 1919 eclipse that confirmed Einstein's theory of relativity. Princeton, New Jersey: Princeton University Press. ISBN978-0-691-18386-2. OCLC1051138098.
Kennefick, Daniel (2019). No shadow of a doubt: the 1919 eclipse that confirmed Einstein's theory of relativity. Princeton, New Jersey: Princeton University Press. ISBN978-0-691-18386-2. OCLC1051138098.