Tannenbaum, Frank
Columbia University Press, 1966
Buku Teks
Ochoa Zazueta, Jesus Angel, author
Secretaría de Educación Pública,, 1974
Buku Teks
Erasmus, Charles J., author
Bobbs-Merrill, 1961
Buku Teks
Augur, Helen
Doubleday & Company, Inc., 1954
Buku Teks
Castaneda, Carlos
Simon and Schuster, 1977
Buku Teks