Spiegel, M. (1972). Theory and problems of statistics. McGraw Hill.
Lua i Stíl Chicago (17ú heag.)Spiegel, Murray. Theory and Problems of Statistics. NewYork: McGraw Hill, 1972.
Lua MLA (9ú heag.)Spiegel, Murray. Theory and Problems of Statistics. McGraw Hill, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.