Orlik, Peter B., author
Allyn & Bacon, 1994
Buku Teks
Eastman, Susan Tyler, author
Wadsworth, 1985
Buku Teks
Burton, Philip Ward, 1910-, author
Grid Publishing, 1978
Buku Teks
Burton, Philip Ward, 1910-, author
NTC Business Book, 1991
Buku Teks
Clarke, George Timothy
New York University, 1959
Buku Teks