Szulc, S. (1965). Statistical methods. Pergamon Press.
Lua i Stíl Chicago (17ú heag.)Szulc, Stefan. Statistical Methods. Oxford: Pergamon Press, 1965.
Lua MLA (9ú heag.)Szulc, Stefan. Statistical Methods. Pergamon Press, 1965.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.