Lindner, Arno, editor
Wageningen Academic, 2011
eBooks
edited by Henry Swan and Dyfed Lewis
Avi Pub., 1974
Buku Teks
World Health Organization, 1986
Buku Teks
Hall, R.P.
Blaisdell Publishing, 1964
Buku Teks
Wilson, Eva, 1925-, author
John Wiley & Sons, 1967
Buku Teks