Winch, Christopher
Routledge, 2008
Buku Teks
editor Philip Cam
Korean National Commission for UNESCO, 2003
Buku Teks
Makarenko, A.S.
Progress Publishers, 1965
Buku Teks
Wingo, Glenn Max, 1913-
Sterling, 1974
Buku Teks
edited by Nelson B. Henry
University of Chicago Press , 1955
Buku Teks