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place an acknowledgement in the footer of a page where you use the images indicating source as well as a link and/or acknowledgement on the site's copyright page if you have one.
Why not consider taking some pictures yourself? That way you'll know who owns the copyright
Where should we include an acknowledgment?
In such a case, how do we make sure that we don't fall into such a trap?
Creative Commons licensing does not mean images are free to use for commercial ends, there are different levels of Creative Commons licensing.
I would like to go by the book, and so, I am looking for free resources, (if any) that provide access to images?