Opatha RVM, H.H.D.N.P. Nayakathwaya: Bauddha Muuladarma (Leadership: Buddhist Principles). Magathi Institute, Sri Lanka; 2009.

Opatha HHDNP. Human Resource Management: Personnel. Colombo: Department of HRM, University of Jayewardenepura. 2009.

Opatha STL, H.H.D.N.P. Relationships between Human Resource Manager-related Factors and Practice of Strategic Human Resource Management in Sri Lankan Listed Firms. Sri Lankan Journal of Human Resource Management. 2007;1:71–87.

Opatha HHDNP. Character as an Essential Quality: A Reflection. Sihinsara. 2006;1:3–10.

Opatha HHDNP. Sri Lanka Journals Online. Sabaragamuwa University Journal. 2006;6:82–92.

Opatha HHDNP. An Empirical Investigation of Management-related Factors Contributing to Labour-Management Relationship in Manufacturing Firms in Sri Lanka. Sasin Journal of Management. 2005;11:85–102.

Akuratiyagamage VM, Opatha HHDNP. Grievances of Middle Managers. Journal of management. 2004.

Opatha HHDNP. Job performance evaluation of Sri Lankan university lecturers: an agenda for action and a suggested scheme. Journal of Humanities and Social Sciences. 2004;1:59–87.

Akuratiyagamage VM, Opatha HHDNP. Grievances of middle managers: an empirical investigation into perceptions of commercial bank branch managers in Sri Lanka. Journal of Management Research. 2004;4:99.

Opatha HHDNP. Applications in Employee Performance Evaluation. Author; 2003.

Fonseka C. Development of Health in Sri Lanka. Sabaragamuwa University Journal. 2003;3:3–18.

Opatha HHHDNP. Research methods for human resource management: questions and answers, Part 1. Colombo: Author Publication. 2003.

Opatha HHDNP. Research Methods for Human Resource Management: Questions and Answers. Part; 2003.

Opatha HHDNP. Are labour relations and leadership styles significantly associated? An empirical study in ten manufacturing firms in Sri Lanka. Utara Management Review. 2003;4:9–19.

Opatha HHDNP. Employee Performance Evaluation Systems: An Evaluative Study of Selected Public Quoted Manufacturing Firms in Sri Lanka. Sabaragamuwa University Journal. 2003;3:137–153.

Opatha HHDNP. Is labour relations dependent on education, industrial relations education and experience of union officials? an empirical study on ten manufacturing firms in Sri Lanka. 2003.

Opatha HHDNP. Employee Discipline Management. Godage International Publishers (pvt) Ltd; 2002.

Opatha HHDNP. Sri Lankan Critical Incidents in Industrial Relations. Author; 2002.

Opatha HHDNP, Ismail ZB. An Empirical Investigation of Management–Related Factors Contributing to Labor-Management Relationship in Manufacturing Firms in Sri Lanka. NMMS Journal, January–June. 2002:74–85.

Opatha HHDNP. Managerial Attitudes Towards Labour Unions: Some Suggestions. Journal of the National Institute of Plantation Management. 2002;18:27–36.