"primary sources of information" is correct and usable in written English.
You can use it when referring to original sources of information such as research, interviews, observations, and documents. For example: The researcher relied on primary sources of information, including interviews with survivors of the disaster, to write her report.
Primary sources of information were garnered from interviews with key informants in the programme area.
"People maintain a strong relationship with radio and TV, which are still their primary sources of information and entertainment.
This gives the impression - for the huge number of people for whom he and the government are the primary sources of information about it - that the poverty situation is beginning to be resolved, thanks to the outcomes of the G8.
Chief Justice Earl Warren and his colleagues did the crucial job of gathering evidence and interviewing key figures in the Kennedy assassination, thereby preserving the primary sources of information for future examination by historians.
The case made by Scientists for EU is measured in tone and, though it could be clearer on some points, is supported by extensive citation of primary sources of information.
News and social media platforms like Facebook, Instagram and Flipboard have overtaken traditional news outlets as our primary sources of information, of news, of connection to the world around us.
The Net also became a primary source of information during the initial SARS outbreak.
The primary source of information for the average Afghan is the radio, often a transistor made 30 years ago.
The primary source of information comes only from the vendor, and the vendor has a conflict of interest in telling you the truth.
Politico reported that Trump was most successful in the emerging news deserts where social-media sites are people's primary source of information.
Those answering calls use the website as their primary source of information, and can quickly spot problems with the site and pass them onto their technical colleagues.
