edited by Sheldon Rosenberg
Macmillan, 1965
Buku Teks
Hockey, Susan M.
Oxford University Press, 1985
Buku Teks
Cunningham, Lawrence S.
Cengage Learning, 2018
Buku Teks
Kaufmann, Walter
Reader's Digest Press, 1977
Buku Teks
Dawson, Paul
Routledge, 2005
Buku Teks