Shapiro, H.L.
Oxford University Press, 1939
Buku Teks
Shapiro, Harry L.
UNESCO, 1953
Buku Teks
Conroy, Hilary
University of California Press, 1953
Buku Teks
Bendure, Glenda, author
Lonely Planet, 2003
Buku Teks
Wallace, Robert, author
Amsterdam Time Life 1974
Buku Teks