Mayrhofer, Manfred, 1926-, author
Heidenberg , 1956
Buku Referensi
Stappers, H.
Librairie Larousse, [date of publication not identified]
Buku Referensi
Collins Clear-Type Press, 1960
Buku Referensi
Bakker, Gerbrand, author
Uitgeverij Piramide, 1997
Buku Teks
Weekley, Ernest, author
Dover Publications, 1967
Buku Referensi