CREATE TABLE table_name_92 (format VARCHAR, region VARCHAR, date VARCHAR)

Which format had a United States region and a date of August 11, 2009?
SELECT format FROM table_name_92 WHERE region = "united states" AND date = "august 11, 2009"
SELECT "format" FROM "table_name_92" WHERE "august 11, 2009" = "date" AND "region" = "united states"