edited by Michael Nylan, Michael Loewe
Cambridge University Press, 2010
Buku Teks
Reddy, Amulya Kumar N., author
United Nations Environment Programme, 1979
Buku Teks
Frederick A. Praegere , 1964
Buku Teks
edited by Colin Harris, Brian Clifford
British Library, 1985
Buku Teks
Barnett, A. Doak (Arthur Doak), author
Frederick A. Praeger, 1965
Buku Teks