Ente nazionale per l'energia elettrica, International Energy Agency, & Executive Conference on Photovoltaic Systems for Electric Utility Applications. (1992). Photovoltaic systems for electric utility applications: Opportunities, critical issues, and development perspectives : proceedings of the executive conference, 2-5 December 1990, Taormina, Italy. OECD.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ente nazionale per l'energia elettrica, International Energy Agency, و Executive Conference on Photovoltaic Systems for Electric Utility Applications. Photovoltaic Systems for Electric Utility Applications: Opportunities, Critical Issues, and Development Perspectives : Proceedings of the Executive Conference, 2-5 December 1990, Taormina, Italy. Paris: OECD, 1992.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ente nazionale per l'energia elettrica, et al. Photovoltaic Systems for Electric Utility Applications: Opportunities, Critical Issues, and Development Perspectives : Proceedings of the Executive Conference, 2-5 December 1990, Taormina, Italy. OECD, 1992.