Não informado. (1996). Requirements Engineering. Springer Verlag.
Lua i Stíl Chicago (17ú heag.)Não informado. Requirements Engineering. Surrey, Inglaterra: Springer Verlag, 1996.
Lua MLA (8ú heag.)Não informado. Requirements Engineering. Springer Verlag, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.