Need Clarification on getting Refund ...

Hello Fiends,

I have to file ITR 1 for my friend, who has income only from salary. The employer has deducted excess TDS,so we want to claim refund the same.

My doubt is whether we need to attach cancelled cheque along with ITR 1 for getting the refund or furnishing the bank details asked for in the form ITR 1 is sufficient ?...

Kindly advise me..... Thank you.