Artikel Jurnal
Block, Michael S., author
Saunders Elsevier, 2011
Buku Referensi
Block, Michael S., author
Elsevier/Saunders, 2015
Buku Teks
Cousley, Richard, author
Wiley Blackwell, 2013
Buku Teks
edited by Stuart J. Froum
Wiley-Blackwell, 2010
Buku Teks