I wont insist much here because Wikipolicy is weak It just says Secondary sources are secondhand accounts at least one step removed from an event They rely for their material on primary sources often making analytic or evaluative claims about them For example a review article that analyzes research papers in a field is a secondary source for the research This publication is from  in fact you should have seen that its in a print and Guttenberg hadnt invented the press in the th century yet and is talking about a person who had lived two centuries before Skanderbeg died in  and his father who had supposedly been in Kastoria died in the s so Bardhi the author a catholic bishop wrote more than two full centuries after Still probably even the translation is wrong so I will leave this in the memory of the talk page so that a latinist might solve it