Mentor book, 1956
Buku Referensi
Hart, James D., author
Oxford University Press, 1986
Buku Referensi
Doseo Chulphan Asia, 2006
Buku Referensi
Oxford University Press, 1942
Buku Referensi
edited by Joseph T. Shipley
Writer Publisher, 1979
Buku Referensi