O'Hearn, S. (2017). OCA Oracle database SQL exam guide: (exam 1Z0-071). McGraw-Hill Education.
Cita Chicago Style (17a ed.)O'Hearn, Steve. OCA Oracle Database SQL Exam Guide: (exam 1Z0-071). New York: McGraw-Hill Education, 2017.
Cita MLA (8a ed.)O'Hearn, Steve. OCA Oracle Database SQL Exam Guide: (exam 1Z0-071). McGraw-Hill Education, 2017.
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