Berend Joukes Fridsma: ferskil tusken ferzjes
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Rigel 22:
* [http://www.godutch.com/newspaper/index.php?id=837] ''Oldest living Calvin College professor emeritus Fridsma dies at age 100. Tireless Frisian heritage promoter'', 7 novimber 2005.
* [http://www.archiefleeuwardercourant.nl/site/article.do?code=LC&date=19911206&id=LC-19911206-27001&words=+%28+tjitte%20+piebenga%29%20tjit%20piebenga] [[Tjitte Piebenga]] oer poëzij fan Fridsma, [[Ljouwerter Krante]], 6 desimber 1991.
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