Baumgarte, Thomas W. author
Cambridge University Press, 2010.
Buku Teks
Crockatt, Richard, author
Oxford University Press, 2016
eBooks
Davies, Paul
Simon & Scuster , 1995
Buku Teks
Einstein, David
Berkeley, Calif.: McGraw-Hill, 1996,
Buku Referensi
Verwey, Albert
Amsterdam : Wereldbibliotheekvereniging, 1955
Buku Teks