Proceedings of the XXIInd International Congress of Psychology :
Leipzig, GDR, July 6-12, 1980.
APA Citation
International Congress of Psychology (22nd : 1980 : Leipzig, G., International Union of Psychological Science. (1980). Proceedings of the XXIInd International Congress of Psychology: Leipzig, GDR, July 6-12, 1980. Leipzig: International Union of Psychological Science.
MLA Citation
International Congress of Psychology (22nd : 1980 : Leipzig, Germany), and International Union of Psychological Science. Proceedings of the XXIInd International Congress of Psychology: Leipzig, GDR, July 6-12, 1980. Leipzig: International Union of Psychological Science, 1980.
Warning: These citations may not always be complete (especially for serials).