The phrase "according to knowledgeable sources" is correct and usable in written English.
It can be used when referencing information or claims that are supported by experts or credible individuals in a particular field.
Example: "According to knowledgeable sources, the new policy will significantly impact the industry."
Alternatives: "according to expert opinions" or "as stated by informed sources".
The Hollywood Reporter had this account: According to knowledgeable sources, the issues were Olbermann's repeated unauthorized absences as well as "sabotaging the network" and "attacking Current and its executives".
When and if Gambino should depart or otherwise cease to be a Mafia boss, his successor as head of the family but not necessarily as boss of bosses— would probably be Dellacroce, according to knowledgeable sources.
But according to knowledgeable sources, this effort shares the defect of broader U.S. policy toward Iran -- it is tentative and ill-coordinated, and it undermines diplomacy without bringing serious pressure on the regime.
Today, according to knowledgeable sources, Mossberg is the paper's highest-paid writer, earning, with bonuses, about five hundred thousand dollars a year; beginning reporters earn about forty-four thousand dollarsenior senior correspondents as much as a hundred and forty thousand dollars.
Indeed, It turned out that Kim was not a diplomat at all, but, according to knowledgeable sources, a nuclear scientist sent to Islamabad by the North Korean government as part of a mutually agreed-upon program to learn about Pakistan's nuclear weapons program.
What he has done, according to knowledgeable sources, is apply himself and work at his game.
"The "surprising" collapse of the Iraqi army and the defection of key Sunni tribal leaders to al-Qaeda-inspired insurgents has largely stripped the CIA of spies in the embattled country, according to knowledgeable intelligence sources.
This comes amid public outcry for Sony Music to drop the producer, according to "knowledgeable individuals".
According to knowledgeable informants, Mr. Kroesen tried last spring to hire former Brig.
According to knowledgeable officials, Qatar has allowed the United States to store ammunition at a secret facility in the desert.
The Palestinians, according to knowledgeable officials, are being asked to begin vigorous action against Hamas and other militant groups.
