Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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