I came across this question,
I don't think it's on-topic.
If it is off-topic, How to close it? Which reason suits it?
However, we have this question. It's clear that more effort was put into the question (and answer) than to say "I think it's [x]", "Find this [y]", or "Where can I look for [z]" as such statements were the motivation for having source/research requests off-topic on Sports SE. See this for more information on research requests.