KT-chaiyo,

I think you should just follow what mandale-murdabad is suggesting. You should include this experience even if you are not claiming any points for this experience because it shows what you were doing at that period.

In my case, I obtained the letter from Department Chief, but did not include the business (visiting) card as he did not have one. Since phone number will be on the official letter pad of your department or campus, I think you should be fine without submitting separate business card.

Good luck!