Jesness, Jerry
Corwin Press, 2004
Buku Teks
Axtell, Roger E.
John Wiley & Sons, 1995
Buku Teks
edited by Harold B. Allen
McGraw-Hill, 1965
Buku Teks
Morgan, John, 1944-2004
Cambridge University Press, 1983
Buku Teks
Thornburn, Scott, 1950-
Cambridge University Press, 2017
Buku Teks