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Libgen has a couple of books from Parpola. He seems a legit Assyrologist.
https://en.wikipedia.org/wiki/Simo_Parpola
The first serious work about the relation between Hungarian and Finnic language was published in 1770, the title (in short): Demonstratio. It was written by a Jesuit astronomer, Sajnovics János, who traveled to Norway to stare at the stars (he frequently called a linguist as if it meant the same as it means to be a linguist today or 50 years back, it makes no sense).
He acquired a couple of books, made by Danes and Swedes and whoever was around, about the language of Finns and Lapps. These books contained dictionaries, but the words looked absolutely strange. He had to speak with Lapps to ascertain it is similar to Hungarian.
Those foreigners tried to transcribe the sounds of Finnish languages with their inadequate alphabet. So for example as vowels one bloke used 39 diphthongs in his effort to put words onto paper. This resulted in words like "vuoigi" or "zhioaarve" with little help how to pronounce them really. In Hungarian these words are vaj (butter) and szarv (horn). Sajnovics could simplify the writing with the use of that Latin alphabet which was already fit into the Hungarian language more or less.
It is very important that those work on the research of their languages who are natively speak that. Too bad noone knows how Sumerian sounded in reality. I do not believe in the "reconstructions" or that song someone put onto youtube neither.