Asher, Herbert B., author
The Dorsey Press, 1980
Buku Teks
Asher, Herbert B., author
The Dorsey Press, 1984
Buku Teks
Kessel, John H., author
Dorsey Press, 1980
Buku Teks
Kessel, John H., author
Dorsey-Press, 1984
Buku Teks
Barber, James David
Prentice-Hall, 1977
Buku Teks