For a review of the Mexican government, Mexican legal materials and online resources, see An Electronic Guide to Mexican Law by Francisco Avalos and Elisa Donnadieu.
Justia Mexico posts Mexican primary legal materials in Spanish for free. Includes the Mexican constitution, state and federal laws, codes, and regulations.
Lexis has a strong collection of Mexican legal materials in Spanish including the Civil, Commercial and Penal Codes, Federal Laws, the Diario Oficial de la Federacion and Supreme Court decisions.
Westlaw has the the Diario Oficial de la Federacion.
West publishes the Mexican Civil Code Annotated and Mexican Commercial Code Annotated in Spanish with English translation and annotations to leading judicial opinions, law review articles and legal treatises.
Key tax, securities, corporate, employment, investment and related laws are discussed in the Baker & McKenzie guide to Doing Business in Mexico and the Lex Mundi Guide to Doing Business in Mexico on Lexis (INTLAW;LMBGMX). See also "Doing Business in Foreign Countries.""
For more help finding legal materials, see the separate entry for "Foreign Laws."
Company Information: Kompass Latin America on Dialog (File 586) is a relatively low-cost directory of Mexican companies. Skyminder provides Business Credit Reports and Legal Structure Reports on business companies from Negociatión y Servicios Empresariales, S.C (NYSE).