editors-in-chief, Sybil P. Parker, Jay M. Pasachoff
McGraw-Hill, 1993
Buku Referensi
Zeilik, Michael, author
Saunders College, 1992
Buku Teks
edited by Michael Hoskin
Cambridge University Press, 1997
Buku Referensi
Smart, W.M.
Cambridge University, 1962
Buku Teks
McGraw-Hill, 2003
Buku Referensi