Fine, Nathan J., author
Rand McNally, 1965
Buku Teks
Fine, Nathan J., author
Rand McNally, 1965
Buku Teks
Willson, Jack D.
McGraw-Hill , 1967
Buku Teks
McFarland, Dora
Mass. Heath , 1968
Buku Teks
Spiegel, Murray R., author
Mc Graw-Hill, 1974
Buku Teks