Bassett, W.H., author
Chapman and Hall, 1995
Buku Teks
edited by Stephen Battersby
Routledge, 2017
Buku Teks
Morgan, Monroe T., author
Thomson, 2003
Buku Teks
National Environmental Health Association, 2018
Majalah, Jurnal, Buletin
Yassi, Annalee, author
Oxford University Press, 2001
Buku Teks