APA (7th ed.) Citation

International Gilbert & Sullivan Festival Philadelphia, Pa.), Gilbert, W. S., & Sullivan, A. (1997). Fourth International Gilbert & Sullivan Festival, highlights for Philadelphia. s.n..

Chicago Style (17th ed.) Citation

International Gilbert & Sullivan Festival Philadelphia, Pa.), W. S. Gilbert, and Arthur Sullivan. Fourth International Gilbert & Sullivan Festival, Highlights for Philadelphia. [Philadelphia, Pa.?: s.n., 1997.

MLA (9th ed.) Citation

International Gilbert & Sullivan Festival Philadelphia, Pa.), et al. Fourth International Gilbert & Sullivan Festival, Highlights for Philadelphia. s.n., 1997.