Atkins, J.W.H., author
Methuen, 1951
Buku Teks
edited by J.M. Morrell
Penguin Books, 1950
Buku Teks
Heawood, Edward, 1863-1949, author
Paper Publications Society, 1986
Buku Teks
edited by Edward Chielens
Greenwood Press, 1986
Buku Referensi
edited by Claudine Salmon
Institute of South East Asia Studies, 2013
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