Contact the newspaper directly. If the issue you are interested in is relatively recent and you'd like a hard copy, go to the paper's website follow their guidelines for how to request a back issue. Many newspapers keep archived issues for up to six months, which they make available for purchase.
Search Google News Archives. Google News Archives has created a database of millions of digitized copies of numerous local, city and international newspapers dating back more than 200 years. They include not only the article texts, but also photographs, headlines and advertisements. Go to the Google News Archives home page, enter your desired topic and click "Search Archives." Or, perform a more detailed search by clicking the hyperlink "Advanced Archive Search." Here, you can select for the specific time period, newspaper source and language by entering your search criteria in the designated fields. Then, click "Search Archives." Some of the articles displayed will be available to view for free; however, others will require a small fee.
Subscribe to an online library like Highbeam.com. Highbeam is another excellent source for back issues of newspapers as they have approximately 80 million articles from various daily, weekly and international newspapers dating back to the 1980s. Purchase access to their database with a monthly or yearly subscription. To perform a search, enter your topic in the search field and click "search." Or, click the "Advanced Search" hyperlink to enter additional search criteria.
The Library of Congress houses an enormous collection of bound and microfilmed newspapers dating back to the 1600's. This collection includes both national and international newspapers in many different languages. Ask a librarian to help you access the collection. The main branch of your local library may also have archived newspapers stored on microfilm or microfiche. Check your library's collections database to find out what resources are available.