" 

 : My ability to evaluate the sources is hampered by my lack of knowledge of Norweigan, but I'll give it a go: 
 :* flipkart and americanpoems could be used to source basic information (eg. ISBN, publication date etc.), but don't establish notability - they only show that the book exists, not that it is notable. 
 :* IDG, if I understand correctly, is the book's Norweigan publisher?  If so, then it is a primary source - again it can be used to source some basic information, but does not establish notability. 
 :* digi.no seems to be an adequately WP:reliable source, so should be OK, although I can't evaluate how significant the coverage is.  Assuming they have no connection with the author or publisher these should be fine as independent references. 
 :* The link to a freely distributable copy of the book should be perfectly fine, I believe, but make sure it appears in an External Links section at the end (after the references) rather than in the body text of the article. 
 : If my evaluation is correct, then we only have one independent source so far (although they do cover it three times) so one or two other sources would be very handy and assuage any doubts people may have over notability.  "