Meyer-Lubke, W., author
Carl Winter's Universitatsbuchhandlung, 1935
Buku Referensi
Gamillscheg, Ernst, author
Carl Winter's Universitatsbuchhandlung, 1928
Buku Referensi
Mayrhofer, Manfred, 1926-, author
Heidenberg , 1956
Buku Referensi
Kluge, Friedrich, 1856-1926, author
Walter De Gruyter, 1963
Buku Referensi
Mackenfen, Lutz, author
Laupheim Pfahl 1952
Buku Referensi