1. Online Document International Trade Center (2005) Building corresponding technical infrastructures to support sustainable development and trade. Bulleting, no. 80, p. 16. http://www.intracen.org/tdc/Export%20Quality%20Bulletins/eq80eng.pdf (accessed 4 Mar 2009)
2. Online Document ISO (2006) Three pillars of sustainable development—metrology, standardization and conformity assessment. ISBN 92-67-10416-0, © ISO, 2006-02/3 000. http://www.iso.org/iso/devt_3pillars_2006-en.pdf (accessed 4 Mar 2009)
3. Online document “Implementation of Metrology Infrastructures of the Americas to Support Free Trade and Quality of Life” submitted to the Organization of American States (OAS) by the United States of America through the Inter-American Agency for Cooperation and Development (IACD), approved by the General Assembly of SIM. http://www.sim-metrologia.org.br/docs/projects_OEA.pdf (accessed 4 Mar 2009)
4. Webpage: http://www.sim-metrologia.org.br (accessed 5 Mar 2009)