Here's an imaged page from a published work. The flagged paragraph provides an abstract of a document recorded in an eighteenth-century deed book. ...
Sources give us information from which we select evidence. If our research is thorough and we have soundly analyzed our findings, we might reach a conclusion. The body of evidence on which we base that conclusion is our proof.
As students, we learned to classify sources into two types, as a basis for evaluating reliability. Primary sources, theoretically, would be original, contemporary records.