Hitchfield, E. M. (1973). In search of promise: A long-term national study of able children and their families. Longman in association with the National Children's Bureau.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Hitchfield, E. M. In Search of Promise: A Long-term National Study of Able Children and Their Families. London: Longman in association with the National Children's Bureau, 1973.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Hitchfield, E. M. In Search of Promise: A Long-term National Study of Able Children and Their Families. Longman in association with the National Children's Bureau, 1973.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.