CREATE TABLE table_12252 ("Round" FLOAT, "Date" TEXT, "Event" TEXT, "Circuit" TEXT, "Winning Driver" TEXT, "Winning Team" TEXT)

Which Winning Driver has a Circuit of circuit zandvoort?
SELECT "Winning Driver" FROM table_12252 WHERE "Circuit" = 'circuit zandvoort'
SELECT "Winning Driver" FROM "table_12252" WHERE "Circuit" = 'circuit zandvoort'