APA (7th ed.) Citation

Roop, P., Roop, C., & Arnsteen, K. K. (1997). Let's celebrate Halloween. Millbrook Press.

Chicago Style (17th ed.) Citation

Roop, Peter, Connie Roop, and Katy Keck Arnsteen. Let's Celebrate Halloween. Brookfield, Conn.: Millbrook Press, 1997.

MLA (9th ed.) Citation

Roop, Peter, et al. Let's Celebrate Halloween. Millbrook Press, 1997.