Kristin L. Goodheart, James R. Clopton, Jacalyn J. Robert-McComb, editor
CRC Press, 2012
Buku Teks SO
edited by Craig Donnellan
Independence Educational Publishers, 1994
Buku Teks SO
Keel, Pamela K.
Pearson/Prentice Hall, 2005
Buku Teks SO
Keel, Pamela K.
Pearson Prentice-Hall, 2005
Buku Teks SO
Gilbert, Sara
Sage Publications, 2000
Buku Teks SO