Gilbert, Neil, author
Prentice-Hall, 1986
Buku Teks
Gilbert, Neil, author
Allyn and Bacon, 1998
Buku Teks
Gilbert, Neil, author
Prentice-Hall, 1974
Buku Teks
Dobelstein, Andrew W., author
Wadsworth, 2003
Buku Teks
Dobelstein, Andrew W., author
Thomson Brooks/Cole, 2003
Buku Teks