Berend Joukes Fridsma: ferskil tusken ferzjes

* 'De Friezen wurde krekt sa diskriminearre as de negers' <ref>Oanhelle yn {{Aut|[[Rudy Kousbroek|Kousbroek, Rudy]]}} (1986/2008) ''De logologische ruimte : Opstellen over taal'', s.&nbsp;103. Amsterdam : Athenaeum Boekhandel Canon. ISBN 978 90 8964 002 4. ([http://books.google.nl/books?id=kd0PFb1iY1YC&pg=PA103&lpg=PA103&dq=%22b.+j.+fridsma%22&source=bl&ots=zujOXCu8SJ&sig=znsuaObZXA6djho_3jb1nAy0Qao&hl=nl&ei=vv1fS5jmOcTS-QbxqMXNDA&sa=X&oi=book_result&ct=result&resnum=4&ved=0CBQQ6AEwAw#v=onepage&q=%22b.%20j.%20fridsma%22&f=false] Google Books])</ref>

* [https://web.archive.org/web/20101125013222/http://www.godutch.com/newspaper/index.php?id=837] ''Oldest living Calvin College professor emeritus Fridsma dies at age 100. Tireless Frisian heritage promoter''], Godutch.com, 7 novimber 2005 ([[Internet Archive]]).