American Society of Mechanical Engineers, 2018
Majalah, Jurnal, Buletin
Symposium on Appropriate Technology. November 30, 1976, Jakarta
Jakarta: University of Indonesia, 1977
Buku Teks
Elsevier Science Inc., 660, 2018
Majalah, Jurnal, Buletin
Technology Review, Inc,
Majalah, Jurnal, Buletin
CommIT Journal,
Majalah, Jurnal, Buletin