Armstrong, J. Scott, author
John Wiley & Sons, 1985
Buku Teks
Ayres, Robert U., author
McGraw-Hill, 1969
Buku Teks
Nersesian, Roy L.
Quorum Books , 1990
Buku Teks
Levenbach, Hans, author
Lifetime Learning Publications, 1981
Buku Teks
Hanke, John E., author
Pearson - Prentice Hall, 2009
Buku Teks