Fiumara, Gemma Corradi, author
Blackwell , 1992
Buku Teks
Carroll, John B., author
Prentice-Hall, 1964
Buku Teks
Recanati, Francois, author
Blackwell, 1993
Buku Teks
Howard, Darlene V., author
Macmillan, 1983
Buku Teks
Katz, Jerrold J., author
Harper & Row, 1966
Buku Teks