Informal Citations -- Some of the Phrases You Could Use
according to
as reported by
as stated in
affirms that
agrees that
asserts that
validates
as you could read in
[name of person/author] states in [name of source] that. . .
[name of person/author] , an expert on [the subject], says that . . .
[name of person/author, the author of . . . , writes. . . (or wrote that. . . )
reports that
says that
In found in [name of source] that. . .