Pekka Leviäkangas, author
Faculty of Engineering, Universitas Indonesia, 2013
Artikel Jurnal
Heinemann Educational Books , 1973
Buku Teks
Mackenzie, W.J.M.
Longmas, Green and Co, 1957
Buku Teks
Robson, R., author
Macmillan, 1957
Buku Teks
Chapman, Richard A., author
Constable, 1970
Buku Teks