Maslansky, Steven P., author
Van Nostrand Reinhold, 1997
Buku Referensi
edited by John E. Hay
United Nations Environment Programme, 1995
Buku Teks
Brunner, Calvin R., author
McGraw-Hill, 1993
Buku Referensi
Maslansky, Steven P.
New York Van Nostrand Reinhold 1997,
Buku Referensi
edited by Milagros S. Simmons
Lewis Publisher, 1991
Buku Teks