Ricklefs, M.C. (Merle Calvin), 1943-, author
NUS Press Singapore, 2007
Buku Teks
Clark, Brian, author
Natural History Publications (Borneo) SDn Bhd, 2010
Buku Referensi
Sage, 1998
Buku Teks
Susan M. Shaw and Janet Lee, editor
McGraw-Hill, 2012
Buku Teks
Palacio do Itamaraty 2000,
Buku Referensi