Krishnan D. S. Cengage Foundation Series General Mental Ability. Cengage Learing India Pvt. Ltd.
芝加哥风格引文Krishnan D. S. Cengage Foundation Series General Mental Ability. Delhi: Cengage Learing India Pvt. Ltd.
MLA引文Krishnan D. S. Cengage Foundation Series General Mental Ability. Cengage Learing India Pvt. Ltd.
警告：这些引文格式不一定是100％准确.