Tham khảo Hiệu_quả

  1. ↑ Dictionary.com, LLC. "Effectiveness | Define Effectiveness at Dictionary.com." Dictionary.com | Find the Meanings and Definitions of Words at Dictionary.com. 2011. Web. 28 Sept. 2011.<http://dictionary.reference.com/browse/effectiveness>.
  2. ↑ Peter F. Drucker (2006). The Effective Executive: The Definitive Guide to Getting the Right Things Done. New York: Collins.
  3. ↑ DIN EN ISO 9241-11. Ergonomic Requirements for office with visual display terminals – Guidance on usability. Beuth, Berlin (1998)
  4. ↑ Commander’s Handbook for Strategic Communication and Communication Strategy, US Joint Forces Command, 2010
  5. ↑ Longman, Pearson. "Effective - Definition from Longman English Dictionary Online." Longman English Dictionary Online. 2011. Web. 04 Oct. 2011.<http://www.ldoceonline.com/dictionary/effective>.