KARMEL P H POLASEK. (1978). APPLIED STATISTICS FOR ECONOMISTS (4TH.). PITMAN PUBLICATIONS.
Lua i Stíl Chicago (17ú heag.)KARMEL P H POLASEK. APPLIED STATISTICS FOR ECONOMISTS. 4TH. BOSTON: PITMAN PUBLICATIONS, 1978.
Lua MLA (9ú heag.)KARMEL P H POLASEK. APPLIED STATISTICS FOR ECONOMISTS. 4TH. PITMAN PUBLICATIONS, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.