Tracking Online Donations from Marketing Source

Through RE and BBMS - can we track the amount of online donations that came in from a specific marketing channel? We want to know which marketing dollars are being well spent. For example, are we getting donations from an ad placed in certain locations or an email blast, etc.? Right now, we are only seeing the number of people going to our donation page from these, not if the visitor donates. Ideally, we could get that, and the donation amount raised through a specific source.