Osborner, David
Pustaka Binaman Pressindo, 1996
Buku Teks
edited by Francis E. Rourke
Little, Brown, 1978
Buku Teks
Leiserson, Avery, 1913-
The University of Chicago Press, 1942
Buku Teks
Sage Publications, 1980
Buku Teks
Robinson, Glen O.
West Publishing, 1974
Buku Teks