Dinitto, Diana M., author
Pearson, 2012
Buku Teks
Dinitto, Diana M., author
Prentice-Hall, 2000
Buku Teks
Eyestone, Robert, author
John Wiley & Sons, 1978
Buku Teks
Loury, Glenn C.
Buku Teks
Edberg, Mark Cameron, 1955-, author
Jones and Bartlett, 2007
Buku Teks