The use of a source in writings and comments

The use of a source in writings and comments

When people are using sources in writings, those sources should be that everybody can confirm that data by using the same sources, what the first writer has been used. This is the normal rule in life. If the person uses the discussion or some other thing like a lecture as the source, that person should identify the source sharply.

That thing is that there should mention the date and time and the place, where that lecture has been given, and who was the person, who gave the lecture. Things like a lecture in the year 1900 at some university in Paris are not very sharp data.

Of course, the source would be mention in the form "the lecture, what Dr. David Hilbert gave in the international mathematical conference in Paris in the year 1900". But if the person tells that the lecture was given in Paris in some year is not a very sharp way to give the sources.

Of course, David Hilbert could give many lectures during that meeting, and that's why some tip to lecture, like "lecture where Hilbert introduced the Millenium problems for mathematics" or something like that would be a good tip if somebody would like to check facts and ask the minutes or records of that lecture from the host. This kind of data will be useful information if somebody wants to check, what Hilbert said in those lectures, and that would also contain the data, what other people were taking in that meeting.