edited by Svend Dahl and H.G. Topsae-Jensen; translated by W. Glyn Jones
Berlingske Bogtr, 1955
Buku Teks
Nangkula Utaberta, author
Fakultas Teknik Universitas Indonesia, 2003
UI - Skripsi (Membership)
Berlin Volkseigener Verlag 1966
Buku Teks
Hans Kartikahadi, author
Bhuana Ilmu Populer, 2010
Buku Teks
Posener, Julius, author
MIT Pres, 1992
Buku Teks