Shapiro, Harry L.
UNESCO, 1953
Buku Teks
edited by Avtar Brah and Annie E. Coombes
Routledge, 2000
Buku Teks
A Galaxy Book, 1961
Buku Teks
Kitano, Harry H.L.
Prentice-Hall, 1974
Buku Teks
Shapiro, Eli, author
Holt, Rinehart and Winston,Inc., 1968
Buku Teks