Petrash, J. (2002). Understanding Waldorf education: Teaching from the inside out. Gryphon House.
Цитирование в стиле Чикаго (17-е изд.)Petrash, Jack. Understanding Waldorf Education: Teaching from the Inside Out. Beltsville, Md: Gryphon House, 2002.
Цитирование MLA (9-е изд.)Petrash, Jack. Understanding Waldorf Education: Teaching from the Inside Out. Gryphon House, 2002.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.