William Warren ... [and others] ; phographer, Luca Invernizzi Tettoni
Periplus editions, 1997
Buku Referensi
Dumarcay, Jacques
Orchid Press, 2003
Buku Teks
FRIM-UNDP/GEF peat Swamp Forest Project, 2005
Buku Teks
Lall, Vikram
Malaysia JF Publishing, 2014
Buku Referensi
Chihara, Daigoro
E.J. Brill, 1996
Buku Teks