Godwin-Austen, Richard Bertram
Sheldon, 1993
Buku Teks
Bennett, Claire L.
John Wiley & Sons, 1982
Buku Teks
Victor R. Preedy, editor
[, Wageningen Academic], 2012
eBooks
Robert Rosaler, editor
McGraw-Hill, 2002
Buku Referensi
Rosaler, Robert C.
McGraw-Hill, 1995
Buku Referensi