edited by G.E. Gorman
Scarecrow Press, 1990
Buku Teks
edited by Susan Higgins, Meta Brett
Longman, 1984
Buku Referensi
London: A Whitehall Overseas Pub., 1991,
Buku Referensi
UNESCO-UNEP International, 1983
Buku Teks
edited by Ingo Maurer
Laurence King Publishing, 2000
Buku Referensi