Williams, T. Harry
Alfred A. Knopf, 1963
Buku Teks
Beard, Charles A.
New Home Library, 1944
Buku Teks
Alden, John Richard
American Book Company, 1960
Buku Teks
Myers, Margaret G.
Columbia University Press , 1970
Buku Teks
Ritchie, Donald A.
Macmillan, 1985
Buku Teks