These companies will bill your credit card. Your reference librarian can supply you with the names and contact information of these companies. Libraries will not send entire magazines through inter-library loan. If you need to see the whole issue, you will have to go to the library that owns it. If this is not possible, your only other option is to try purchasing it from the publisher.
Many publishers sell back issues if they are in stock.
This usually works best if the item you need was published recently or featured as a special issue.