Harrington, Michael
Simon and Schuster, 1980
Buku Teks
Huttman, Elizabeth Dickerson
McGraw-Hill , 1981
Buku Teks
Bruce, Allan, author
Arena, 1996
Buku Teks
Anderson, Martin, author
Hover Institution Press, 1978
Buku Teks
Doblstein, Andrew W., author
Prentice-Hall, 1980
Buku Teks