Nahm, Sheena
Maryland : Lexington Books, 2014
Buku Teks SO
Braun, Mary Beth
Wolters Kluwer, Lippincott Williams & Wilkins, 2008
Buku Teks SO
Cohen, David
Routledge, 2006
Buku Teks SO
Cattanach, Ann
Jessica Kingsley, 1992
Buku Teks SO
edited by Charles E. Schaefer and Kevin J. O'Connor
John Wiley & Sons, 1982
Buku Referensi