Burgschmidt, Ernst
Dortmund Lambert Lensing 1975
Buku Teks
Oxford University Press,
Majalah, Jurnal, Buletin
Burgschmidt, Ernst
Dortmund Lambert Lensing 1975
Buku Teks
Cagno, Michael
New York R.D. Cortina 1958
Buku Teks
Donald Freeman and Jack C. Richardsand , author
Cambridge Cambridge University Press 1996
Buku Teks