Reference

http://en.wikipedia.org/wiki/Friesland#History

http://en.wikipedia.org/wiki/Frisians#History

http://www.ussgp.com/uss_gp/who_was_greate_pier.htm

http://tberkeley.blogspot.com/

http://basquecountry2014.blogspot.com/

http://books.google.com/books?id=d2WcCIm6WaQC&pg=PA612&lpg=PA612&dq=Frisian+homeland&source=bl&ots=gW-uFcb_oh&sig=NfXMatuhb0uNt6YDEENtB_pc8IM&hl=en&sa=X&ei=lFpjU62VC4LhsASS0ILoCw&ved=0CC4Q6AEwAw#v=onepage&q=Frisian%20homeland&f=false

http://www.holland.com/us/tourism/article/the-frisian-landscape.htm

http://www.whatstheweatherlike.org/netherlands/frisia.htm

http://www.coven-of-cythrawl.com/frisians.htm

http://www.everyculture.com/Europe/Frisians-Religion-and-Expressive-Culture.html

http://books.google.com/books?id=aj1LkG001QwC&pg=PA270&lpg=PA270&dq=Friesland+superstitions&source=bl&ots=fFcDgU5_6J&sig=AIvsymII9g5AFCXSpCiDFvU0-UY&hl=en&sa=X&ei=ykVlU-eKEa2ysATHjYHIDg&ved=0CD4Q6AEwAw#v=onepage&q=Friesland%20superstitions&f=false

http://avibase.bsc-eoc.org/checklist.jsp?region=NLfr&list=howardmoore

http://ibc.lynxeds.com/locality/palearctic/germany/lower-saxony/east-frisian-islands#species

http://www.dedutchman.ca/friesland/

http://www.everyculture.com/wc/Mauritania-to-Nigeria/Frisians.html