Crews, Frederick, author
Random House, 1984
Buku Teks
Crew, Frederick, author
Random House, 1987
Buku Teks
Maimon, Elaine P., author
McGraw-Hill , 2003
Buku Referensi
Mcmahan, Elizabeth
McGraw-Hill, 1984
Buku Teks
Perrin, Porter G., author
Glenview, 1968
Buku Teks