Orpen، C. (1984). How to Make More Effective Use of Group Discussions in Teaching. مجلة التربية، ع65 ، 12 - 15. مسترجع من http://search.mandumah.com/Record/681025
Orpen، Christopher. "How to Make More Effective Use of Group Discussions in Teaching." مجلة التربية ع65 (1984): 12 - 15. مسترجع من http://search.mandumah.com/Record/681025