APA (7th ed.) Citation

International Congress of Psychology. (1983). Mental and Language Retardation - Diagnosis, Development, Rehabilitation: XX-nd International Congress of Psychology, Leipzig, July 6-12, 1980.

Chicago Style (17th ed.) Citation

International Congress of Psychology. Mental and Language Retardation - Diagnosis, Development, Rehabilitation: XX-nd International Congress of Psychology, Leipzig, July 6-12, 1980. Berlin, 1983.

MLA (8th ed.) Citation

International Congress of Psychology. Mental and Language Retardation - Diagnosis, Development, Rehabilitation: XX-nd International Congress of Psychology, Leipzig, July 6-12, 1980. 1983.