Philippatos, George C.
Allyn and Bacon , 1991
Buku Teks
Harrington, Diana R., 1940-
The Dryden Press, 1985
Buku Teks
Philippatos, George C.
Allyn and Bacon , 1991
Buku Teks
Griffin, Paul A.
Prentice-Hall, 1991
Buku Teks
Pandey, I.M.
Tata McGraw-Hill, 1991
Buku Teks