[publisher not identified], 1990
Buku Teks
Kurtz, Marcus J., author
Cambridge University Press, 2004
Buku Teks
Ochoa Zazueta, Jesus Angel, author
Secretaría de Educación Pública,, 1974
Buku Teks
Westview Press, 1987
Buku Teks
Ronfeld, David
Stanford University Press, 1973
Buku Teks