The phrase "a traditional source of" is correct and usable in written English.
It can be used when referring to something that has historically provided or contributed to a particular aspect, such as knowledge, culture, or resources.
Example: "The library has always been a traditional source of knowledge for the community."
Alternatives: "a long-standing provider of" or "a customary origin of".
Bidding for public contracts – a traditional source of revenue for the Sicilian and Neapolitan mafia – was made more transparent.
Indigenous plants are used as a traditional source of raw materials for the manufacture of medicines.
Tokyo claims it is trying to prove the whale population is large enough to sustain a return to commercial hunting for a traditional source of food.
Along the Iranian border, the repatriation effort was threatened by recent fighting between warlords struggling for control of border checkpoints, a traditional source of revenue for Afghan commanders.
Beef exports – a traditional source of Argentinian fortune and national pride – have plummeted too, falling behind smaller neighbours Uruguay and Paraguay.
Howard Brunet and his cousin Reggie Parfait attach fishing bait to a rod, fishing being a traditional source of food and income.
Now, the stakes are too high to limit ourselves to traditional sources of funding.
A glass was thrust into my hand – a more traditional source of energy.
The rural population, whose needs are often basic, therefore depends to a large extent on fuel wood as a major traditional source of fuel.
Now, another manlike species has been described using more traditional evidence, from a more traditional source of ancient human remains: Africa.The new species, dubbed Australopithecus sediba, is reported in Science this week by Lee Berger and his colleagues at the University of the Witwatersrand, in Johannesburg.
Hasso Plattner, Klaus Tschira, Deitmar Hopp and Hans-Werner Hector represent a less traditional source of Germany's industrial prosperity software though their fortunes are all founded on one company that the former IBM colleagues co-founded in 1972, SAP.
