Routledge, 2020
eBooks
Burfeind, James W. , author
Jones and Bartlett Publishers, 2011
Buku Teks
Arnold, William R.
Houghton Mifflin, 1983
Buku Teks
Sellin, Thorsten, author
Wiley Eastern Private Limited, 1970
Buku Teks
Pine Forge Press, 1996
Buku Teks