Without in any way whatsover implying that you did, in some countries you cannot present an advert as an article or editorial without clearly marking it as such.
That's why on TVs you get the 'infomercial' warning and the 'this is an advert' banner in papers (certainly in my country anyway).
Having an affiliate link makes the article an advert as you are selling the book. An article such as yours can be interpreted as a shop front masquerading as free advice as soon as you put affiliate links in it, regardless of whether it affected your article or not.
Bloggers are getting away with murder right now compared to print advertising.
I realise this is not your intention, but that's why it is not the same as ad-supported products in general should be held to higher standards as their adverts are usually clearly marked where yours was not.
Bloggers are getting away with murder right
now compared to print advertising
I think this is a little blown out of proportions. Print advertising may be clearly marked as such for obvious advertising, however articles planted by PR firms are not.
That's why on TVs you get the 'infomercial' warning and the 'this is an advert' banner in papers (certainly in my country anyway).
Having an affiliate link makes the article an advert as you are selling the book. An article such as yours can be interpreted as a shop front masquerading as free advice as soon as you put affiliate links in it, regardless of whether it affected your article or not.
Bloggers are getting away with murder right now compared to print advertising.
I realise this is not your intention, but that's why it is not the same as ad-supported products in general should be held to higher standards as their adverts are usually clearly marked where yours was not.