United nations. (2002). Learning throughout Life: Challenges for the twenty-first century. UN.
Цитирование в стиле Чикаго (17-е изд.)United nations. Learning Throughout Life: Challenges for the Twenty-first Century. Condé-sur-Noireau: UN, 2002.
Цитирование MLA (8-е изд.)United nations. Learning Throughout Life: Challenges for the Twenty-first Century. UN, 2002.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.