Dunham, Kelli S., author
F.A. Davis Company, 2004
Buku Teks
Pirie, David B., author
Roetledge, 1985
Buku Referensi
Hally, M. Bernard Dette
Elsevier, 2009
Buku Teks
Pirie, David B.
Routledge, 1985
Buku Teks
Beardsmore, Caroline. author
Wiley-Blackwell,, 2013
Buku Teks