International Organization for Standardization. (1981). Statistical methods (2nd ed.). ISO Central Secretariat.
Lua i Stíl Chicago (17ú heag.)International Organization for Standardization. Statistical Methods. 2nd ed. Geneva: ISO Central Secretariat, 1981.
Lua MLA (9ú heag.)International Organization for Standardization. Statistical Methods. 2nd ed. ISO Central Secretariat, 1981.
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