Robert Hackman

International Olympic Committee . 2016-06-13.
Retrieved 2017-10-07. tsohon ɗan wasan Ghana ne.Ramsamy, Sam (1991). "Apartheid and Olympism: on the Abolishment of Institutionalized Discrimination in International Sport". In Fernand Landry; Marc Landry; Magdeleine Yerlès (eds.). Sport, the Third Millennium: Proceedings of the International Symposium, Quebec City, Canada, May 21-25, 1990. Presses Université Laval. pp. 539–548. ISBN 9782763772677."Robert Hackman Bio, Stats, and Results" .
Olympics at Sports-Reference.com . Archived from the
original on 2020-04-18. Retrieved 2017-10-07. Ya wakilci Ghana a tseren tseren mita 3000 a gasar Olympics ta bazara ta shekarar 1972."Robert Hackman Bio, Stats, and Results" .

Olympics at Sports-Reference.com . Archived from the

original on 2020-04-18. Retrieved 2017-10-07."Robert HACKMAN - Olympic Athletics | Ghana" .

International Olympic Committee . 2016-06-13.

Retrieved 2017-10-07.  

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Category:Mutuwan 2018