Hurd, P. D. (1969). New Directions in teaching secondary school science. Rand McNally.
Цитирование в стиле Чикаго (17-е изд.)Hurd, Paul Dehart. New Directions in Teaching Secondary School Science. Chicago: Rand McNally, 1969.
Цитирование MLA (9-е изд.)Hurd, Paul Dehart. New Directions in Teaching Secondary School Science. Rand McNally, 1969.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.