H. Ursprung, B. (1968). The stability of the differentiated state. Springer-Verlag.
Lua i Stíl Chicago (17ú heag.)H. Ursprung, Baltimore. The Stability of the Differentiated State. New York: Springer-Verlag, 1968.
Lua MLA (9ú heag.)H. Ursprung, Baltimore. The Stability of the Differentiated State. Springer-Verlag, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.