Metzke, E., author
Heidelberg Kerle 1949
Buku Referensi
Vierkandt, Alfred, 1867-1953, author
Stuttgart, Ferdinand Enke Verlag
Buku Referensi
Henderson, I. F., author
Harlow, England Longman Scientific and Technical
Buku Referensi
Page, G. Terry
New York Kogan Page 1977
Buku Referensi
Ahmad Ramali, author
Jakarta Djambatan 1969
Buku Referensi