edited by Irene Yeung
Government Information Office, 2002
Buku Referensi
Schwartz, Harry
Atheneum, 1966
Buku Teks
Schwartz, Harry
Atheneum, 1966
Buku Teks
Wenley, A.G.
Smithsonian Institution, 1944
Buku Teks
Scurfield, Elizabeth
NTC Pub. Group, 1992
Buku Teks