Diesing, Paul
Urbana, Ill. University of Illinois Press 1962,
Buku Teks
Firth, Raymond, author
The New American Library, 1958
Buku Teks
Dolgoff, Ralph, author
Thomson Brooks/Cole, 2012
Buku Teks
Moody, Paul E.
McGraw-Hill, 1983
Buku Teks
Organisation for Economic Co-operation and Development, 1986
Buku Teks