Não informado. (1992). Zeiss information with Jena review. Jenoptik Carl Zeiss Jena GmbH.
Lua i Stíl Chicago (17ú heag.)Não informado. Zeiss Information with Jena Review. Oberkochen, Alemanha: Jenoptik Carl Zeiss Jena GmbH, 1992.
Lua MLA (8ú heag.)Não informado. Zeiss Information with Jena Review. Jenoptik Carl Zeiss Jena GmbH, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.