@Dor Beatrice Webb in 1926 but the ideas were well established by others. 1898 “Introduction to the Study of History” by Charles Langlois and Charles Seignobos suggest the best way of proceeding is to make notes on separate pieces of paper with each showing it’s origin. Prior to that in 1638 Thomas Harrison explained to Charles I about writing excerpts on small pieces of paper and hanging them on hooks with alphabetized subject headings. Fascinating discussion here: https://www.lrb.co.uk/the-paper/v32/n11/keith-thomas/diary
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