Data without a source is any item entered anonymously into the database or entered without reference. These are equivalent to wiki entries without references. For many fields it may be ranked too low to be displayed, but its presence in the database can be used as a foundation for data improvement.

Unsourced entries can also be made available for queries to interested parties looking for unsourced leads. Data entered in this manner can only supersede estimated data (which is also undisplayed).

An anonymous entry and an entry without a reference are both included. The presence of the value can provide a lead for later research, but it does not supply the missing evidence or override the stated display and supersession limits.