International Graphical Federation (IGF). (1952). International Graphical Federation: Congress programme 1952 : Second Congress : Great britain : 14th to 21th june 1952.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)International Graphical Federation (IGF). International Graphical Federation: Congress Programme 1952 : Second Congress : Great Britain : 14th to 21th June 1952. 1952.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)International Graphical Federation (IGF). International Graphical Federation: Congress Programme 1952 : Second Congress : Great Britain : 14th to 21th June 1952. 1952.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.