Oliver, T. L. (1993). D.D.R. collectors reference guides 1949-1990. T.L.O.-Publ..
Lua i Stíl Chicago (17ú heag.)Oliver, Tony L. D.D.R. Collectors Reference Guides 1949-1990. Eton Wick, near Windsor: T.L.O.-Publ., 1993.
Lua MLA (8ú heag.)Oliver, Tony L. D.D.R. Collectors Reference Guides 1949-1990. T.L.O.-Publ., 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.