Chapman, Elwood N., author
Prentice-Hall, 1996
Buku Teks
Fraser, John Munro, author
London, Sir Issac Pitman
Buku Teks
Dubin, Robert, author
Prentice-Hall, 1974
Buku Teks
Dubin, Robert, author
Prentice-Hall, 1968
Buku Teks
Dubin, Robert, author
Prentice Hall of India, 1977
Buku Teks