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Buku Referensi
Robinson, Danielm, author
Lonely Publications Pty Ltd, 2011
Buku Referensi
King, Victor T., author
Foris Publications, 1985
Buku Teks
Davidson, Jamie S., author
NUS Press Singapore, 2009
Buku Teks
Mackinnon, John Ramsay, author
Borneo.amsterdam Time Life, 1975
Buku Teks