Tracy, B. (2018). Maximum achievement: Strategies & skills that will unlock your hidden powers to succeed. Manjul Publishing House.
Chicago-tyylinen lähdeviittausTracy, Brian. Maximum Achievement: Strategies & Skills That Will Unlock Your Hidden Powers to Succeed. New Delhi: Manjul Publishing House, 2018.
MLA-viiteTracy, Brian. Maximum Achievement: Strategies & Skills That Will Unlock Your Hidden Powers to Succeed. Manjul Publishing House, 2018.
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