The phrase "assertion comes from" is correct and usable in written English.
It can be used when discussing the origin or source of a particular assertion or claim.
Example: "The assertion comes from a study conducted by leading researchers in the field."
Alternatives: "claim originates from" or "statement derives from".
The data for this assertion comes from a Pew Research poll conducted just a few days before the election.
"Every garden should include some plants that die beautifully". This odd-sounding assertion comes from landscape designer Tom STomrTommiTom
As he and his colleagues show in a paper posted on arXiv, an online repository, littoral islands may actually exacerbate, rather than diminish, the effects of these waves.Anecdotal evidence for this counterintuitive assertion comes from (mercifully rare) episodes where the same tsunami has battered different types of coastal topography.
This assertion comes from equality (113) and the application of the properties of the q-Laplace transform, stated in Proposition 7 in the same manner as it has been done throughout the work, so we omit the details at this point.
"We have no idea where that assertion comes from.
This assertion comes from his friendships with a majority of his employees.
The same assertion came from 66 of 362 families questioned, or 18percentnt.
His evidence for this incredible assertion came from a report by French anthropologists Marcel Griaule and Germain Dieterlen, who in the 1930s and 1940s had studied the traditions and mythology of the Dogon, a remote West African tribe located about 300 kilometers south of Timbuktu in Republic of Mali.
This is a particularly galling assertion coming from someone who claims to be a documentary filmmaker himself.
Indirect evidence for these assertions comes from a study showing that schizophrenic subjects are more likely than control subjects to interpret averted gaze as being directed at them (Hooker and Park 2005).
