Cunningham, A. M. (1982). The Ballinger papers: Being the papers of Margaret and William Ballinger. Library, University of the Witwatersrand.
Lua i Stíl Chicago (17ú heag.)Cunningham, Anna M. The Ballinger Papers: Being the Papers of Margaret and William Ballinger. Johannesburg: Library, University of the Witwatersrand, 1982.
Lua MLA (8ú heag.)Cunningham, Anna M. The Ballinger Papers: Being the Papers of Margaret and William Ballinger. Library, University of the Witwatersrand, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.