Williams, T. Harry
Alfred A. Knopf, 1963
Buku Teks SO
Risjord, Norman K.
Prentice-Hall, 1985
Buku Teks SO
Myers, Margaret G.
Columbia University Press , 1970
Buku Teks
by John M. Blum ... [et al.]
Harcourt, Brace & World, 1963
Buku Teks SO
edited by Frank Freidel and Norman Pollack
Rand McNally, 1963
Buku Teks SO