إشكالية قوة العمل الفضية

• http://news.asiaone.com/News/Latest+News/Singapore/Story/A1Story20130312-407882.html

• http://watchdog.org/210607/silver-collar-workforce/

• http://www.francobritishcouncil.org.uk/conferences.php/61/silver-workers-turn-to-gold.-older-people-in-the-workforce-comparisons-and-contrasts-between-the-uk-

• http://www.hays.com.sg/press-releases/HAYS_209264

• https://en.wikipedia.org/wiki/Aging_in_the_American_workforce

• https://www.kpmg.com/US/en/IssuesAndInsights/ArticlesPublications/Documents/turn-silver-grey-into-gold.pdf