Lomio, J. Paul (2008) - UES, F&I Reference
compiled by Oscar Cetrángolo and Juan Carlos Gómez-Sabaini (2006) - UES
United Nations (2001) - UES; STA/ESA/PAD/SER.E/21 (pdf, 2001).
Chaturvedi, K. N. (2008) - LES
Practicing Law Institute (PLI) - Westlaw: PLIREF-TAX
Comprehensive databases of regional tax information from around the world. Checkpoint provides U.S. tax laws and analysis, along with both translated and primary source tax...
RIA - Westlaw: RIA-TAXT (current) - treaties between the U.S. and other countries, technical explanations, Senate Committee reports, Secretary of State reports and other...