Cannot save documentation pages from networkx.org

For instance https://networkx.org/documentation/stable/reference/algorithms/generated/networkx.algorithms.centrality.katz_centrality.html#networkx.algorithms.centrality.katz_centrality.
The icon says "saving to my library"
Debug ID is D2144542559.
I see stuff about DOI in the debug output. But I don't care about the DOI, I just want a citation for this webpage.
If I cannot save this page, how do I manually create a citation?
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