Duncan, K., & Hodgkin, H. (1991). Howard Hodgkin: Hand-coloured prints, 1986 - 1991 ; catalog of an exhibition held Mar. 27 - Apr. 20, 1991 at Waddington Graphics, London/ [catalogue coordination by Katharine Duncan]. Waddington Graphics.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Duncan, Katharine, و Howard Hodgkin. Howard Hodgkin: Hand-coloured Prints, 1986 - 1991 ; Catalog of an Exhibition Held Mar. 27 - Apr. 20, 1991 at Waddington Graphics, London/ [catalogue Coordination by Katharine Duncan]. London: Waddington Graphics, 1991.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Duncan, Katharine, و Howard Hodgkin. Howard Hodgkin: Hand-coloured Prints, 1986 - 1991 ; Catalog of an Exhibition Held Mar. 27 - Apr. 20, 1991 at Waddington Graphics, London/ [catalogue Coordination by Katharine Duncan]. Waddington Graphics, 1991.