Whittlesey, Charles R.
Macmillan, 1954
Buku Teks
Whittlesey, Charles R.
Macmillan, 1969
Buku Teks
Whittlesey, Charles R.
Macmillan, 1967
Buku Teks
Ritter, Lawrence S., author
Basic Books, 1974
Buku Teks
Kamerschen, David R.
South-Western Publishing Co., 1992
Buku Teks
Black, Tyrone
Business Publications, Inc., 1981
Buku Teks