Krishnan D. S. Cengage Foundation Series General Mental Ability. Cengage Learing India Pvt. Ltd.
Čikaški stil citiranja (17. izdanje)Krishnan D. S. Cengage Foundation Series General Mental Ability. Delhi: Cengage Learing India Pvt. Ltd.
MLA način citiranja (9. izdanje)Krishnan D. S. Cengage Foundation Series General Mental Ability. Cengage Learing India Pvt. Ltd.
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