I have encountered this several times.
I have a report published by an establishment, for an example say national geographic comeetee. When they wrote the report they intentionally dont put author name.
When I insert a reference I will put the national geographic comeetee as author and then the in text reference is something like (Comeetee, g. N. 2012).
When I fix the text manually it keeps reformating.
Does anyone have a tip?