The document summarizes sources of business information available through the library, including electronic databases like Nexis UK and reference books providing company details. Nexis UK allows searching for companies and news articles, and provides financial data and SEC filings. Reference sources include Key British Enterprises, an alphabetical listing of companies with details on activities, directors, sales, and subsidiaries, and Who Owns Whom, detailing parent-subsidiary relationships. Kelly's Industrial Directory lists companies under product headings and alphabetically with addresses and contact information.