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For my info, do we have to give the reference of an article,design, web site or else each time?
It's not a rule. I started dong it just as a nod of recognition to the original site or person who has gone to all the trouble to make the picture and post it on their site or
ebay or wherever.
The original copyright holder really deserves, I think, the extra little added attention their hard work has brought them. Do something good and get some recognition for it.
Sometimes I make the 'Courtesy of . . .' note and link a smaller font, 1, so as not to mar the display.
Really it is most likely a violation of copyright every time I do it but it may be considered 'fair use' as I am not selling anything with the pics, but using them for education.
Also I am not usually copying everything on that site or page but a pertinent part of the page. Referring back to the page or site helps the reader to learn more if they so wish, and from a more expert or knowledgeable source.