https://care.diabetesjournals.org/content/17/2/152
(PDF: https://math.berkeley.edu/~ehallman/math1B/TaisMethod.pdf)
It wasn't until some months later that a response pointed out that the author had rediscovered the trapezoidal method, which was known to Newton and is typically covered in precalculus courses.
You could cite the original source, but it might be inaccessible (and possibly not very complete). A modern article could be easier for the reader, especially if it's a review. Sometimes you might just want a few examples of a phenomenon too, so the choice doesn't matter much.
Honestly, the problem isn't with whom I cite, so much as:
1) Academia deciding to use metrics inappropriately (as well as expecting citations on well-known obvious things). I'm not going to adjust my work style because academics decided to adopt dumb metrics and build massive, dumb incentive structures around those metrics.
2) Reviewers expecting citations for everything, and not caring about quality of those citations. "The sky is blue" doesn't work. "The sky is blue (Blitzerman, Tinkledorf 2012)" works fine, even if Blitzerman, Tinkledorf 2012 is complete nonsense.
"As previous research indicates, the sky is blue ([1], [2], [3], [4], [5], [6], [7], [8], [9])."
Of course you haven't actually looked at all those 9 sources, except maybe the abstract of the first three.
It's difficult to know whether a publication is open or closed when you download it from a research institute or a university (access is automatically granted based on the ip address).
You only realize how much it cost when you try to download it from home.