Lachica, Eduardo
Solidaridad Publishing House, 1971
Buku Teks
Artikel Jurnal
Haskew, Laurence D.
Scott and Foresman, 1968
Buku Teks
Peters, Herman Jacob, 1917-, author
Macmillan, 1963
Buku Teks
Dewi Tristantini Budi, author
Fakultas Teknik Universitas Indonesia, 2000
UI - Laporan Penelitian