"solid sources" is correct and can be used in written English.
You can use it to refer to reliable sources of information, such as research papers, books, or credible websites. For example, "My research paper was based on solid sources, including three scholarly journal articles."
My colleagues, every statement I make today is backed up by sources, solid sources.
"Every statement I make today is backed up by sources, solid sources," Mr. Powell told the United Nations.
"One of his strengths is the ability to depend on solid sources: that's what his reporting was based on," said Lina Attalah, the editor of Mada Masr.
This isn't necessarily a terrible idea; burying his research in this way enables him to keep the narrative flowing, and he had plenty of solid sources from which to extrapolate.
While nothing has been official confirmed by either party yet, the information comes from solid sources, according to multiple publications.
The most common one-step CVD is based on the reaction of gaseous MoO3 and S evaporated from solid sources due to the simplicity of processing and the easy availability of solid sources [12].
I must turn to a more solid source; Father Christmas.
It's a better, funnier and more solid source than most of the german webpages.
School groups, a typically solid source of income, will be slow to return, given the classroom time lost because of the storm.
Mayor Rudolph W. Giuliani yesterday returned to what has been a solid source of support throughout his political career -- the Liberal Party, and its leader, Raymond B. Harding -- and asked for the party's backing as he sets his sights on the United States Senate.
He is a son of Sandra Miller and Charles J. Miller of Atlanta, where his mother is a real estate agent at Solid Source Realty and his father is a sales representative for Serena Software.
