Davies, Ioan
Routledge, 1995
Buku Teks
edited by Warren Crichlow and Cameron McCarthy
Routledge, 1995
Buku Teks
Johnson, Allen W.
Stanford Univ. Press, 1978
Buku Teks
Bates, Daniel G
McGraw-Hill, 1990
Buku Teks
edited by James A. Clifton
Houghton Mifflin, 1968
Buku Teks