1. Organisation for Economic Co-operation and Development (OECD) 1976 Developments in Educational Leave of Absence. OECD, Paris
2. Organisation for Economic Co-operation and Development (OECD) 1978 Alternation Between Work and Education: A Study of Educational Leave of Absence at Enterprise Level. OECD, Paris
3. Educational Leave for Employees: European Experience for American Consideration;Von Moltke,1977