The reference to the source of authority should be definite. Such vague phrases as the following, common though they are, are worthless as proof : —

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Notes from Wikiquote

It may be said on substantial authority — | Many prominent men agree — | Competent authorities say — | We could give hundreds of cases to show — | Recent writers on this subject declare — | One had better not pretend to prove anything than to seek to cover bare assertions with such flimsy material. | p. 59; as cited in: Branham (2013, p. 77)

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Quote text and notes from Wikiquote: William Trufant Foster (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.