Strickland, Warren L., author
Burgess , 1964
Buku Teks
Harbeck, Richard M., author
Holt Rinehart and Winston, 1965
Buku Teks
Tillery, Bill W., author
McGraw-Hill, Higher Education, 2007
Buku Teks
Merken, Melvin, author
Saunders College Publishing, 1993
Buku Teks
Hewitt, Paul G., author
Addison-Wesley, 2010
Buku Teks