Departamento de Hacienda:
http://www.hacienda.gobierno.pr/
Internal Revenue Service:
http://www.irs.gov
National Association of Tax Professionals:
http://www.natptax.com/
http://www.taxprofessionals.com/
National Association of Enrolled Agents:
http://www.naea.org/MemberPortal/
Puerto Rico Society of Enrolled Agents:
http://www.PRSEA.com
Federation of Tax Administrators:
http://www.taxadmin.org/fta/link/forms.html
American Bar Association Tax Index:
http://www.abanet.org/tax/sites.html
Colegio de Abogados de PR:
http://www.capr.org/
American Institute of CPA's:
http://www.aicpa.org
Colegio de CPA's de PR:
http://www2.colegiocpa.com/index.html
Servicio Gratuito de Leyes de PR:
http://www.estado.gobierno.pr/Leyes_PR.htm