Dear Jim  You have asked a very good question about published interviews  I believe that Wikipedia editors and reviewers take each case individually in this situation  For example if a person is interviewed by a professional journalist and the interviewer writes introductory information we assume that he or she would have checked the facts before writing it  Also if the person being interviewed gives noncontroversial information such as My restaurant is in London England the interview can be used to back up that fact Surely the interviewer would have spoken up it this obvious fact were not true However if in the same interview the person says Everyone loves my spaghetti sauce that wouldnt be accepted An independent food critic would need to write about that In general interviews are weak sources because most of the text is the subjects own words and people dont always see themselves as others see them  The weaker the source the more are needed to corroborate facts  However if there are a number of different interviews published in reliable sources they should be included as references because the fact of being interviewed  means that the subject had come to the attention of the press  Interviews which are not published shouldnt be used at all  In reference to your article I see that some of the events happened long ago  There are surely news reports about some of these happenings but they may be hard to find because there was no Internet then  I faced the same problem when creating this page Toronto Light Opera Association  I couldnt use my mothers first hand information as a source I had to travel to a city library and look up old microfilm newspaper records    By the way I have removed the Op Cit references in the article and changed them to refer to the actual source  Op cit doesnt work well in Wikipedia because people will come along and add a citation to a new source in between and then the op cit points to the wrong reference  I hope this helps