For the prompt “Using a favorite quotation from an essay or book you have read in the last three years as a starting point, tell us about an event or experience that helped you define one of your values or changed how you approach the world. Please write the quotation, title and author at the beginning of your essay” does the quotation really have to be from an academic essay or book? I’d like to use a quote from a blog but I’m not sure if that bends the prompt too much.
I have read many interesting essays in blogs and other websites. The prompt does not exclude such sources, but you are taking a risk. I would definitely provide the address (with an “as of” the date you accessed it),and you might even take a screen shot for backup. You would probably be better off with a more traditional starting point, but I don’t think you’d be out of line.
@richardc2117 data point of one, but my son was admitted to Princeton after using a quote from a widely discussed “manifesto” penned by a game designer on his website. Our son didn’t think to save the actual text (yikes! …that’s a good idea @AboutTheSame), but the quote from was just a jumping off point for my son’s writing. Good luck.
My son worked backwards. He wrote an open ended essay for Yale, and then found a quote from a book he was reading and used that quote at the beginning of his Princeton essay. FWIW: He was accepted to both YP.