Paris, Roland, author
Cambridge University Press, 2004
Buku Teks
Bartram, JW
London [etc.] Longmans [etc.] 1899
Buku Teks
Franklin, Miles, author
Angus and Robertson, 1974
Koleksi Publik
Naisbitt, John, author
Pan Books, 1990
Buku Teks
Oceana, 1957
Buku Teks