user: Question: What is the source on 6 September?
Columns: ['Date', 'Place', 'Race winners', 'GP winner', 'Source']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['29 March', 'Castelnau', 'Daniël Willemsen / Dagwin Sabbe', 'Jan Hendrickx / Tim Smeuninx', 'Result']
SQL:

assistant: SELECT "Source" FROM "Table" WHERE "Date" = '6 September';