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If you are using them as proof, why wouldn't you get them translated?
 
Roger55 said:
Is it necessary to translate the business cards for reference letters? Please advise.

Yes, why not? If it is in a language other than english, you must translate it through authorised translators.
 
SISH7255 said:
Yes, why not? It it is in a language other than enflish, you must translate it.

Exactly. Translate it like any other documents that are not in English (ie, with translator certification).