Smith, Mike (J. Mike), author
Oxford University Press, 1990
Buku Teks
Johnson, Stuart, author
Oxford Univesity Press, 2009
Buku Teks
Langan, John, 1942-, author
McGraw-Hill, 1992
Buku Teks
Scholastic, 1987
Buku Teks
edited by John E. Hay
United Nations Environment Programme, 1995
Buku Teks