The phrase "numerous sources" is correct and is commonly used in written English.
Example sentence: I consulted numerous sources to determine the correct answer.
The hostility has numerous sources.
According to numerous sources, the accounts are multiplying.
Pollution from numerous sources of sewage and industrial effluent are serious challenges too.
They took data from numerous sources to provide a view on a companies ethical status.
The article was based on numerous sources, including some inside Apple, and involved reporting in China.
The excessive fear of communist subversion was fed by numerous sources.
Price told Guardian Australia that while she was not at the event, the incident had been verified by numerous sources.
The people who serve at the pleasure of the current President are, according to numerous sources, causing him displeasure.
"I was warned by numerous sources that the DE political establishment is going to use every resource available to them".
Numerous sources said on Wednesday that Azarpeik was picked up from the offices of Tejarat-e-Farda, a pro-reform weekly based in the Iranian capital.
However, as numerous sources Sandomir chose not to interview will attest, the job of creating the actual program and bringing it to air fell to yours truly.
