edited by Charles W. Donovan
Imperial College Press, 2015
Buku Teks
Maria Elfani, author
Fakultas Teknik Universitas Indonesia, 2011
Artikel Jurnal
edited by T. Nejat Veziroglu
Hemisphere, 1983
Buku Teks
Cassedy, Edward S., author
Cambridge University Press, 2000
Buku Teks
Shea, Cynthia Pollock.
Worldwatch Institute, 1988
Buku Teks