Corwin, Edward S., author
Holt, Rinehart and Winston, 1988
Buku Teks
Welch, Joseph N., author
Houghton Miffiln, 1956
Buku Teks
Alexander Seran, author
2010
UI - Disertasi (Open)
Amery, L.S., author
Oxford University Press, 1953
Buku Teks
Cox, Archibald, 1912-2004, author
Houghton Mifflin, 1987
Buku Teks