Nelson, Gideon E., author
John Wiley & Sons, 1984
Buku Teks
Silverstein, Alvin, author
Rinehart and Winston, 1974
Buku Teks
Kalthoff, Klaus, author
McGraw-HIll, 2001
Buku Teks
edited by Philip Winn
Routledge, 2001
Buku Referensi
Jaeger, Edmund C.
Charles C Thomas Publisher, 1950
Buku Referensi