Reynold, Lloyd George
McGraw-Hill, 1981
Buku Teks
Boobs-Merrill, 1963
Buku Teks
Salvadori, Massimo, author
Bobbs-Merrill, 1963
Buku Teks
Malabre, Alfred L., author
Dow Joner-Irvin, 1989
Buku Teks
Robertson, Ross M., author
Harcourt, Brace & World, 1964
Buku Teks