Gilbert, Neil, author
Prentice-Hall, 1974
Buku Teks
Bell, Winifred, author
Macmillan, 1983
Buku Teks
Federico, Ronald C., author
McGraw-Hill, 1990
Buku Teks
Dobelstein, Andrew W., author
Wadsworth, 2003
Buku Teks
Dobelstein, Andrew W., author
Thomson Brooks/Cole, 2003
Buku Teks