CREATE TABLE table_46537 ("Name" TEXT, "Country" TEXT, "Loan Club" TEXT, "Started" TEXT, "Ended" TEXT, "Start Source" TEXT)

What is the start source of the irl country, which ended on 13 April?
SELECT "Start Source" FROM table_46537 WHERE "Country" = 'irl' AND "Ended" = '13 april'
SELECT "Start Source" FROM "table_46537" WHERE "Country" = 'irl' AND "Ended" = '13 april'