Blackwell Publishing, 2003
Buku Teks
Gallion, Arthur B., author
D. Van Nostrand, 1963
Buku Teks
Artikel Jurnal
edited by Werner Z. Hirsch
Johns Hopkins University Press, 1966
Buku Teks
Chapin, F. Stuart (Francis Stuart), 1916-, author
University of Illinois Press, 1979
Buku Teks