Mathies, P. (1928). Drei Generationen Mathies.
Lua i Stíl Chicago (17ú heag.)Mathies, Peter. Drei Generationen Mathies. Berlin, 1928.
Lua MLA (8ú heag.)Mathies, Peter. Drei Generationen Mathies. 1928.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.