Utilizing business databases' abilities to search by industry codes, such as the NAICS or SIC, can help you retrieve comprehensive results, whether you are looking for industry information or whether you are trying to identify businesses in a category. In Business Source Ultimate, put the letters "IC" before the code to generate a NAICS-based search; either IC 561910 or IC "561910" will work. You will find articles related to the topic in trade publications and academic journals using BSU, as well as market research reports. If you do not know a code, you can search by keyword. Then either scan the NAICS/Industry tags on the left to limit your results, or click the title of a likely article. If a code is associated with the article, it will be hotlinked from the abstract, allowing you to expand your search to access any entry including that code.