Gomez Cadenas, Juan Jose, author
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eBooks
Nelson, Vaughn
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Buku Teks
edited by Charles W. Donovan
Imperial College Press, 2015
Buku Teks
Maria Elfani, author
Fakultas Teknik Universitas Indonesia, 2011
Artikel Jurnal
Shea, Cynthia Pollock.
Worldwatch Institute, 1988
Buku Teks