O. Norshahira, S. R. Norashida, and Z. M. Lukman, “Content Validity Determination of the Suicidal Ideation Behaviour Assessment Instruments Using Content Validity Ratio (CVR) Formula: SUICIDAL IDEATION BEHAVIOUR ASSESSMENT”, J. Drug Delivery Ther., vol. 11, no. 4-S, pp. 81–85, Aug. 2021, doi: 10.22270/jddt.v11i4-S.4968.