(1990). Science year 1991: The world book annual science supplement: A review of Science and Technology During the 1990 School year. Оникс.
Цитирование в стиле Чикаго (17-е изд.)Science Year 1991: The World Book Annual Science Supplement: A Review of Science and Technology During the 1990 School Year. chicago: Оникс, 1990.
Цитирование MLA (8-е изд.)Science Year 1991: The World Book Annual Science Supplement: A Review of Science and Technology During the 1990 School Year. Оникс, 1990.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.