John Wiley & Sons, 2005
Buku Teks
Nissenson, Allen R., author
Elsevier Saunders, 2008
Buku Referensi
Daniel D. Karp, editor
Wolters Kluwer, 2015
Buku Teks
McMahon, Linnet, author
Routledge, 1992
Buku Referensi
edited by Diane Elizabeth Waller and Andrea Gilroy
Open University Press, 1992
Buku Referensi