The phrase "which according to" is correct and usable in written English. It is typically used when referring to something that has been previously mentioned, or when providing an explanation. For example: "The job requires a Master's degree, which according to the qualifications, must be in a related field."
Which, according to Bourdieu, makes us snobs.
They chose the forest which, according to Aravena, was wise.
Which, according to recent books on adolescence, there is.
The choir's job - which, according to its music director, Capt.
-- I shall now lay down the principles which according to my understanding govern the case.
To the subject, then, which, according to Loach, should always dictate the style.
Note: Baby is unbelievably cute, which, according to most users, makes this all worth it.
Namlish, spoken in Namibia, which according to The Namibian Sun only has one rule: no grammar.
The Presbytery of Brooklyn called it preaching, which according to its rules was forbidden to women.
Jenny Slate smokes pot regularly, which, according to Pew Research, one in eight Americans do.
Australia's superannuation industry has approximately $2tn under management which, according to Deloitte, will double by 2025.
Being a terminologist, I care about word choice. Ludwig simply helps me pick the best words for any translation. Five stars!
Maria Pia Montoro
Terminologist and Q/A Analyst @ Translation Centre for the Bodies of the European Union