APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (8e ed.) Bronvermelding

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