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
Myers, Margaret G., author
Columbia University Press , 1970
Buku Teks
edited by Frank Freidel and Norman Pollack
Rand McNally, 1963
Buku Teks