by G.S. Puri ... [and others]
Oxford & IBH Publishing, 1990
Buku Teks SO
edited by Bas Arts ... [and others]
Wageningen Academic, 2012
eBooks
Korner, Christian
Springer, 2012
eBooks
edited by F.B. Golley
Elsiver, 1983
Buku Referensi
Nichol, John
David & Charies, 1990
Buku Referensi