Croft, Kenneth
Mass. Winthrop , 1972
Buku Teks
editor, Ronald Mackay, Bruce Barkman, R.R. Jordan
Newbury House Publishers, Inc., 1979
Buku Teks
Thornburn, Scott, 1950-, author
Cambridge University Press, 2017
Buku Teks
Jesness, Jerry, author
Corwin Press, 2004
Buku Teks
edited by Harold B. Allen
McGraw-Hill, 1965
Buku Teks