
New York Daily News http://www.nydailynews.com/archives/entertainment/2000/05/11/2000-05-11_a_renaissance_man_tackles_sh.html (2000-05-11)
2000–2004
2010s, 2015, Presidential Bid Announcement (June 16, 2015)
New York Daily News http://www.nydailynews.com/archives/entertainment/2000/05/11/2000-05-11_a_renaissance_man_tackles_sh.html (2000-05-11)
2000–2004
Your Job-Hunt Ltd – Advice from an Award-Winning Asian Headhunter (2003), Successful Recruitment in a Week (2012) https://books.google.ae/books?idp24GkAsgjGEC&printsecfrontcover&dqnigel+cumberland&hlen&saX&ved0ahUKEwjF75Xw0IHNAhULLcAKHazACBMQ6AEIGjAA#vonepage&qnigel%20cumberland&ffalse, 100 Things Successful People Do: Little Exercises for Successful Living (2016) https://books.google.ae/books?idnu0lCwAAQBAJ&dqnigel+cumberland&hlen&saX&ved0ahUKEwjF75Xw0IHNAhULLcAKHazACBMQ6AEIMjAE
In an interview with the Midland Reporter Telegram on 4 July 1989, quoted in Bush's Brain: How Karl Rove Made George W. Bush Presidential (John Wiley and Sons, 2003) by James Moore and Wayne Slater, p. 161.
1980s
Announcement speech https://www.washingtonpost.com/opinions/how-donald-trump-helped-democrats-pass-obamacare/2015/06/22/002f4c7c-18ea-11e5-ab92-c75ae6ab94b5_story.html (June 2015)
2010s, 2015
[Positive attitude key to success, says Gaur Gopal Das, https://timesofindia.indiatimes.com/city/nagpur/positive-attitude-key-to-success-says-gaur-gopal-das/articleshow/62501124.cms, Times of India, 15 January 2018]
Video commentary featured on website of the Chicago Public Education Fund http://www.cpef.org/nm_video.htm#
Tarkan Q & A, Tarkan Translations, April 10, 2003 http://tarkantr.blogspot.com/2005/05/q.html,