Henderson-Sellers, B.
John Wiley & Sons, 1987
Buku Teks SO
Bronmark, Christer
Oxford, 2004
Buku Teks SO
Springer-Verlag, 1990
Buku Teks SO
Bronmark, Christer
Oxford University Press, 2018
eBooks
National Institute of Ecology and International Scientific, 1982
Buku Teks SO