user: Question: What source has Delph as the name?
Columns: ['Nat.', 'Name', 'Status', 'Contract length', 'Expiry date', 'Source']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['ANG', 'Rui Marques', 'Signed', '2 years', 'May 2010', 'Leeds United']
SQL:

assistant: SELECT "Source" FROM "Table" WHERE "Name" = 'Delph';