Newkirk, John A.
Addison-Wesley, 1983
Buku Teks
Millman, Jacob, author
Erlangga, 1987
Buku Teks
Norman, Colin, author
Worldwatch Institute, 1980
Buku Teks
edited by M. Balkanski
North-Holland , 1991
Buku Teks
Till, William C.
Prentice-Hall, 1982
Buku Teks