Artikel Jurnal
Silverstein, Alvin, author
Rinehart and Winston, 1974
Buku Teks
Gaordon Rees Jones, Anthony G. Deakin, Joseph W. Spencer, editor
CRC Press, Taylor & Francis Group, 2008
Buku Teks
Millar, David I. A., author
Springer, 2012
eBooks
Hopwood, Val, author
Churchill Livingstone, 2010
Buku Teks