Uvarov, E.B
Penguin Books, 1976
Buku Teks
Reading, Hugo F., author
Routledge & Kegan Paul, 1978
Buku Teks
Buku Teks
Henry W. Art, general editor ; foreword by F. Herbert Bormann ; contributing editors, Daniel Botkin [and others]
Henry Holt, 1993
Buku Referensi
editor in chief, Charles A. Ford
Encyclopedia Britannica Educational Corporation, 1969
Buku Referensi