Não informado. (1997). Systems research and behavioral science. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)Não informado. Systems Research and Behavioral Science. Chichester, Inglaterra: John Wiley & Sons, 1997.
Lua MLA (8ú heag.)Não informado. Systems Research and Behavioral Science. John Wiley & Sons, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.