Within Reports> Booking List Report you can report on Referral source, inquiry date and many other components of a Booking.

Use Filters to report on a specific Referal Source/s & narrow down your results.

Alternatively, the Group By Option allows you to easily report on all Referal Sources

When Grouped, exporting to HTML or PDF will list each Referral Source separately with its Revenue Summary, and a grand total at the end.