- 193–209, ISBN 978-90-272-1856-8 Hof, Jan
Jelles (1933),
Friesche Dialectgeographie (PDF), The Hague:
Martinus Nijhoff,
archived from the
original (PDF)...
- 193–209, ISBN 978-90-272-1856-8 Hof, Jan
Jelles (1933),
Friesche Dialectgeographie (PDF), The Hague:
Martinus Nijhoff,
archived from the
original (PDF)...
- ISBN 978-0-415-05768-4.
Retrieved 30
March 2017. Hof, Jan
Jelles (1933).
Friesche Dialectgeographie (PDF) (in Dutch). The Hague:
Martinus Nijhoff.
Archived (PDF) from...