Italian Revolutionary Socialist Party
It was founded in 1881 as Revolutionary Socialist Party of Romagna by Andrea Costa, a former anarchist converted to democratic socialism, after his marriage with Anna Kuliscioff. In the 1882 general election Costa was elected to the Italian Chamber of Deputies in Romagna and he later served also as Mayor of Imola. In 1892 the PSRI was merged with the Italian Labour Party to form the Italian Socialist Party, under the leadership of Filippo Turati.
- Massimo L. Salvadori, Enciclopedia storica, Zanichelli, Bologna 2000