Beard, Charles A., author
New Home Library, 1944
Buku Teks
Alden, John Richard, author
American Book Company, 1960
Buku Teks
Ritchie, Donald A., author
Macmillan, 1985
Buku Teks
by John M. Blum ... [et al.]
Harcourt, Brace & World, 1963
Buku Teks
Barnow, Erik
Oxford Univ. Press, 1970
Buku Teks