"most sources agree" is a correct and usable phrase in written English.
You can use it when there is a consensus among multiple sources or points of view on a particular topic. For example, "Most sources agree that the current global climate crisis is a result of human activities."
Most sources agree that the celebration began in 1780 after an image of Jesus appeared on a boulder after the death of a young shepherd boy.
The Fodor's guidebook says it's O.K. to skip the tip if you're only staying one night, and most sources agree it is not necessary to tip in a bed-and-breakfast.
For starters, most sources agree that the soft-serve industry arose in the United States, not Britain, and that it preceded Thatcher's arrival at J. Lyons by about a decade.
Although most sources agree that it's probably Turkish in origin, baklava spread throughout the Ottoman empire, and can be found as far afield as Albania and Azerbaijan – with a similar spread of fillings.
There's no strict definition for what constitutes an heirloom vegetable, but most sources agree that open pollination among plants of the same variety is critical (as opposed to modern hybrids bred for industrial farming) and so is age — most heirloom varieties are more than 50 years old.
Most sources agree Richard's army was larger, but it failed to sweep his enemy from the field.
Accurate numbers of interpreters killed in battle in both wars are difficult to obtain, but most sources agreed that at least 300 were killed in Iraq, and at least 80 in Afghanistan.
Although some have claimed the fungus to be inedible or merely "non-poisonous", most other sources agree that it is edible but flavorless.
Most credible sources agree that it's little more than a non-addictive, 20-second head rush that teleports you through a thumping maze of looping sound and geometric shapes.
During the early stages of its growth, Salford was of greater cultural and commercial importance than its neighbour Manchester, although most contemporary sources agree that since the Industrial Revolution of the late 18th and early 19th centuries that position has been reversed.
Though everyone's biological needs are different, most medical sources agree that adults generally need somewhere in the neighborhood of seven to nine hours of sleep on a regular basis for optimal health, mood, and mental function.[5].
