Dubin, Robert, author
Prentice-Hall, 1968
Buku Teks
Dubin, Robert, author
Prentice Hall of India, 1977
Buku Teks
Chruden, Herbert J., author
South-Western, 1984
Buku Referensi
Stoff, Sheldon Ptaschevitch, author
Harper & Row , 1969
Buku Teks
edited by Keith Davis and William G. Scott
McGraw-Hill, 1959
Buku Teks