Report of the twenty-fourth congress at Hamburg, 1st to 4th September, 1969.

MLA

Report of the Twenty-fourth Congress At Hamburg, 1st to 4th September, 1969. London: ICA, 1970.

APA

(1970). Report of the twenty-fourth congress at Hamburg, 1st to 4th September, 1969. London: ICA.

Chicago

Report of the Twenty-Fourth Congress At Hamburg, 1st to 4th September, 1969. London: ICA, 1970.