George, Jovinda A study on the relationship between sleep pattern and xii standard students' mathematics achievement/ Jovinda George and K. Krishnamoorthy - Madurai : Shamlay pub. 2018 - 97p. 25 cm. Not sent to CRL ISBN: 9789387102651 Rs 250.00 Subjects--Topical Terms: Mathematics--Research Dewey Class. No.: E/O 510.7 / G 293