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
Dinitto, Diana M., author
Pearson, 2012
Buku Teks
Dinitto, Diana M., author
Prentice-Hall, 2000
Buku Teks