Published by B. Blackwell for the United Nations Industrial Development Organization, 1990
Buku Teks
edited by James J. Heaphey
Duke University Press, 1971
Buku Teks
by Dwight Waldo ... [et.al.]
Duke University Press, 1970
Buku Teks
New Century Publications, 2005
Buku Teks SO
Birgit Harley...[et al.], edited
Cambridge University Press , 1990
Buku Teks SO