See Mr. Harris's Speech. P. 8. And delivery were but it is possible, that the conductors of the Meeting, did not then foresee all the consequences in which it would result.
Books can be attributed to "Unknown" when the author or editor (as applicable) is not known and cannot be discovered. If at all possible, list at least one actual author or editor for a book instead of using "Unknown".
Books whose authorship is purposefully withheld should be attributed instead to Anonymous.