The phrase "a probable source of" is correct and usable in written English.
It can be used when discussing something that is likely to be the origin or cause of a particular issue or phenomenon.
Example: "The researchers identified a probable source of the contamination in the water supply."
Alternatives: "a likely origin of" or "a potential cause of".
Even the open source movement, in which public-spirited programmers work together to improve the quality of software, does not seem a probable source of salvation.
Boundary layer instability is suggested as a probable source of the global magnetospheric wave activity.
If silicate weathering is a probable source of sodium, the groundwater samples would have HCO3− as the most dominant abundant anion (Rogers 1989).
Emily Ashby of Common Sense Media cited the latter point as a probable source of concern among parents having their children watch the series.
Oral health is often considered as a probable source of health inequalities in persons with neuromotor and mental deficiencies.
Ca argides and dimer appear a probable source of such interferences.
A probable source is a remnant of a violent supernova next to the galactic center, where magnetic fields trap and accelerate particles, he says.
In spring 2008, a goat farm experiencing Q fever abortions ("Farm A") was identified as the probable source of a human Q fever outbreak in a Dutch town.
Health authorities say a hot tub is the "probable" source of an outbreak of legionnaires' disease in Staffordshire.
Dr. Kelly was found dead on July 18, apparently a suicide, after he had been identified as the probable source of a BBC charge that Mr. Blair and his aides had transformed the dossier in the weeks before its publication to enhance the threat represented by Iraq's weapons.
Dr. Kelly's death has become the subject of a high-profile inquiry led by a senior judge, Lord Hutton, because the scientist was named as the probable source of a damning BBC report questioning the integrity of the case for war put forward by the government of Prime Minister Tony Blair.
