Peters, J. F., Skowron, A., & Rybi¿ski, H. (2008). Transactions on rough sets IX. Springer Berlin Heidelberg.
Lua i Stíl Chicago (17ú heag.)Peters, James F., Andrzej Skowron, agus Henryk Rybi¿ski. Transactions on Rough Sets IX. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008.
Lua MLA (8ú heag.)Peters, James F., et al. Transactions on Rough Sets IX. Springer Berlin Heidelberg, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.