APA (7th ed.) Citation

Orme, H. (2007). Let's explore comets and asteroids. Ticktock Entertainment.

Chicago Style (17th ed.) Citation

Orme, Helen. Let's Explore Comets and Asteroids. Great Britain: Ticktock Entertainment, 2007.

MLA (9th ed.) Citation

Orme, Helen. Let's Explore Comets and Asteroids. Ticktock Entertainment, 2007.