Lyall, Sutherland, author
RajaGrafindo Persada, 2006
Buku Teks
Ambrose, James E., author
Wiley, 1992
Buku Teks
Commerma, Broto i
Page One, 2007
Buku Teks
edited by Cyril M. Harris
McGraw-Hill, 1993
Buku Referensi
Fischer, Robert E., author
McGraw-Hill, 1980
Buku Teks