CREATE TABLE table_28543 ("Round" TEXT, "Circuit" TEXT, "Date" TEXT, "Pole Position" TEXT, "Fastest Lap" TEXT, "Winning Driver" TEXT, "Winning Team" TEXT)

In Round 6, who is the winning team?
SELECT "Winning Team" FROM table_28543 WHERE "Round" = '6'
SELECT "Winning Team" FROM "table_28543" WHERE "Round" = '6'