APA (7th ed.) Citation

Lloyd Webber, A., Hart, C., & Stilgoe, R. (1986). The phantom of the opera. Really Useful Group.

Chicago Style (17th ed.) Citation

Lloyd Webber, Andrew, Charles Hart, and Richard Stilgoe. The Phantom of the Opera. [London]: Really Useful Group, 1986.

MLA (9th ed.) Citation

Lloyd Webber, Andrew, et al. The Phantom of the Opera. Really Useful Group, 1986.