Patrick Mitchell (19 April 2012). "Hillman Curtis, 1961-2012". Society of Publication Designers, SPD. Archived from the original on 13 August 2017. Retrieved 18 January 2016.
Patrick Mitchell (19 April 2012). "Hillman Curtis, 1961-2012". Society of Publication Designers, SPD. Archived from the original on 13 August 2017. Retrieved 18 January 2016.