Orilia, Lawrence S., author
McGraw-Hill, 1982
Buku Teks
Orilia, Lawrence, author
John Wiley & Sons, 1972
Buku Teks
McLeod, Raymond, author
John Wiley & Sons, 1982
Buku Teks
Passen, Barry J., author
John Wiley & Sons, 1978
Buku Teks
Awad, Elias M., author
Prentice-Hall, 1971
Buku Teks