CREATE TABLE table_51181 ("Romaji title" CLOB, "Japanese title" CLOB, "Release date" CLOB, "Reference" CLOB, "Oricon" FLOAT)

What is the reference for the romani title da.i.su.ki?
SELECT "Reference" FROM table_51181 WHERE "Romaji title" = 'da.i.su.ki'
SELECT "Reference" FROM "table_51181" WHERE "Romaji title" = 'da.i.su.ki'