APA (7th ed.) Citation

Viola, H. J., Dixon, M., Miller, A. J., & Remington, F. (1987). Exploring the West. Smithsonian Books.

Chicago Style (17th ed.) Citation

Viola, Herman J., Maynard Dixon, Alfred Jacob Miller, and Frederic Remington. Exploring the West. Washington, D.C.: Smithsonian Books, 1987.

MLA (9th ed.) Citation

Viola, Herman J., et al. Exploring the West. Smithsonian Books, 1987.