Hibbard, M.J.
McGraw-Hill Irwin, 2001
Buku Teks
Klein, Cornelis
John Wiley & Sons, 1985
Buku Referensi
Blackburn, William H.
W.C. Brown Publishers, 1988
Buku Referensi
B. Wasito Kusumoyudo
Binacipta, 1986
Buku Teks
Hurlbut, Cornelius S.
John Wiley & Sons, 1971
Buku Teks