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If your sentence needs a comma to achieve its precise meaning, it probably needs “which.”
William Zinsser • On Writing Well, 30th Anniversary Edition: An Informal Guide to Writing Nonfiction

cholera: in her notebook, ‘Quarry for Middlemarch’, George Eliot noted the appearance of cholera in England in 1831–2.
George Eliot • Middlemarch
E. B. White makes the case cogently in The Elements of Style, a book every writer should read once a year, when he suggests trying to rearrange any phrase that has survived for a century
William Zinsser • On Writing Well, 30th Anniversary Edition: An Informal Guide to Writing Nonfiction
The British, George Orwell famously noted, ‘are a nation of flower-lovers, but also a nation of stamp-collectors, pigeon-fanciers, amateur carpenters, coupon-snippers, darts-players, crossword-puzzle fans’.
Susie Dent • Dent's Modern Tribes: The Secret Languages of Britain
8 weird punctuation marks that faded from the English language
boingboing.net
do not use periods for commas.
William Strunk JR. and E.B. White • The Elements of Style, Fourth Edition
We have all suffered more than our share of these sentences in which an exclamation point knocks us over the head with how cute or wonderful something was. Instead, construct your sentence so that the order of the words will put the emphasis where you want it.