Citazione APA

Robertson, T. W., & Sardou, V. (1869). Progress: A comedy in three acts. s.n..

Stile di citazione Chicago

Robertson, T. W., e Victorien Sardou. Progress: A Comedy in Three Acts. [S.l.: s.n., 1869.

Citazione MLA

Robertson, T. W., e Victorien Sardou. Progress: A Comedy in Three Acts. s.n., 1869.