ABI/Proquest

• ​Suggested search (copy and paste into database):
  (small & medium sized enterprises-SME) and (your keywords here)

Business Source Complete

• Suggested search (copy and paste into database):
  (small business) and (Small to medium-sized enterprises) and (your keywords here)

Science Direct

• Use the Advanced Search feature (link in top right corner) to enter the search strategy below:
  ((SME) and (small and medium sized enterprises)) and (your keywords here)
• ​Use the Subject drop-down list to limit your search to "Business, Management and Accounting". This will identify more targeted results for your search.

Additional resources:

• The Small Business Administration (SBA) publishes state-level small business profiles that provide demographic information about small businesses within the US. The SBA defines a small business as an entity with less than 500 employees.
• The Doing Business 2013: Smarter Regulations for Small and Medium-Size Enterprises report, while global in nature, provides many interesting data points on SMEs in the United States.
• OECD has published many reports about SME development around the globe. A recent report titled "Intellectual Assets and Innovation:The SME Dimension" includes a chapter on the impact of IP regulation on SME growth in the United States.