Very simple, I work with iOS 6 and I did with the following code:
ABRecordRef person = (__bridge ABRecordRef)[_ABRecordCards objectAtIndex:0];
ABRecordRef people[1];
people[0] = person;
CFArrayRef peopleArray = CFArrayCreate(NULL, (void *)people, 1, &kCFTypeArrayCallBacks);
NSData *vCardData = CFBridgingRelease(ABPersonCreateVCardRepresentationWithPeople(peopleArray));
NSString *vCard = [[NSString alloc] initWithData:vCardData encoding:NSUTF8StringEncoding];
NSLog(@"vCard > %@", vCard);
I have NSArraywith elements ABRecordRef...
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