Keedy, Mervin J., author
Addison-Wesley , 1969
Buku Teks
Hafstrom, John E., author
Addison-Wesely, 1961
Buku Teks
Fine, Nathan J., author
Rand McNally, 1965
Buku Teks
Fine, Nathan J., author
Rand McNally, 1965
Buku Teks
Clarkson, Donald R.
The Shoe String Press, 1964
Buku Teks