International Graphical Federation (IGF). (1952). International Graphical Federation: Congress programme 1952 : Second Congress : Great britain : 14th to 21th june 1952.
芝加哥风格引文International Graphical Federation (IGF). International Graphical Federation: Congress Programme 1952 : Second Congress : Great Britain : 14th to 21th June 1952. 1952.
MLA引文International Graphical Federation (IGF). International Graphical Federation: Congress Programme 1952 : Second Congress : Great Britain : 14th to 21th June 1952. 1952.
警告：这些引文格式不一定是100％准确.