Andretta، R. A. (1991). The Individual Versus the System in Tom Stoppard’s Spy Plays Neutral Ground, the Dog it was that Died, and Hapgood. مجلة كلية التربية بالمنصورة، ج17 ، 1 - 30. مسترجع من http://search.mandumah.com/Record/681570
Andretta، Richard A. "The Individual Versus the System in Tom Stoppard’s Spy Plays Neutral Ground, the Dog It Was That Died, and Hapgood." مجلة كلية التربية بالمنصورة ج17 (1991): 1 - 30. مسترجع من http://search.mandumah.com/Record/681570