Heffner, Richard D.
A Mentor Book, 1956
Buku Teks
with introduction by Harold Earl Hammond
Cambridge Book, 1964
Buku Teks
edited by Frank Freidel and Norman Pollack
Rand McNally, 1963
Buku Teks
Risjord, Norman K., author
Prentice-Hall, 1985
Buku Teks
Williams, T. Harry, author
Alfred A. Knopf, 1963
Buku Teks