Nahm, Sheena
Maryland : Lexington Books, 2014
Buku Teks
Braun, Mary Beth
Wolters Kluwer, Lippincott Williams & Wilkins, 2008
Buku Teks
Cohen, David
Routledge, 2006
Buku Teks
edited by Charles E. Schaefer and Kevin J. O'Connor
John Wiley & Sons, 1982
Buku Referensi
Carmichael, Karla D.
Pearson - Prentice Hall, 2006
Buku Teks