Sykes, Alan O.
St.Paul,Minn., 1995
Buku Teks
Jessup, Philip C. (Philip Caryl), 1897-1986, author
Yale University Press, 1956
Buku Teks
Hannerz, Ulf
Routledge, 1996
Buku Teks
St,Paul,Minn, 1994
Buku Teks
Glendon, Mary Ann
St. Paul, Minn West Publishing 1991,
Buku Teks