APA (7th ed.) Citation

Protheroe, W. M., Capriotti, E. R., & (Gerald H.). (1989). Exploring the universe (4th ed.). Merrill.

Chicago Style (17th ed.) Citation

Protheroe, W. M., E. R. Capriotti, and (Gerald H.). Exploring the Universe. 4th ed. Columbus, Ohio: Merrill, 1989.

MLA (9th ed.) Citation

Protheroe, W. M., et al. Exploring the Universe. 4th ed. Merrill, 1989.