User talk:2604:2D80:D28C:F500:4D51:8C64:CF5:F485

Recent edit to Geographic pricing cost index
Hello, and welcome to Wikipedia. I noticed that you made a change to an article, Geographic pricing cost index, but you didn't provide a reliable source. It's been removed for now, but if you'd like to include a citation and re-add it, please do so! If you need guidance on referencing, please see the referencing for beginners tutorial, or if you think I made a mistake, you can leave me a message on my talk page. Thank you! Materialscientist (talk) 17:24, 7 February 2020 (UTC)