The phrase 'authorized sources' is correct and usable in written English.
You would use it when referring to sources that have been formally approved or validated, for example: "All information should be taken from authorized sources only."
Some of these codec packs have been known to cause problems with Windows Media Player and the company advises installing only codecs from authorized sources like the company that officially creates and supplies the software.
Commercial samples of P. japonicum from Japan and Taiwan were obtained from the authorized sources.
Human fetal hearts at 9 weeks of gestation were obtained from authorized sources.
Human fetal hearts were obtained from authorized sources and the pericardium was removed.
Always obtain ISBN assignments from authorized sources, which provide online title management to the Books In Print Database.
We thought we detected a tone of pique among the television reporters that anyone should even consider seeing an eclipse for himself, rather than on television, and we pickedup an implication, never explicit, that blindness was just what was coming to any scab who tried looking at the Universe directly instead of through Authorized Sources.
But it is not clear whether they will have to show, if questioned, that a syringe in their possession came from an authorized source.
But the contraband purchased by Marcone, a St. Louis-based company that claims to be the nation's largest authorized source for appliance parts, was not counterfeit handbags or fake medicines.
The new F.T.C. rules went into effect on April 2, and they required sites to include a prominent notice across the top of each Web page that mentioned free reports declaring that the only authorized source under federal law for such reports is annualcreditreport.com.
Samples of commercial drug of G. tenuifolia were obtained from the authorized source.
Obviously you don't lose your data, but if you still have to have it restored by an authorized source, it amounts to almost the same thing.
