APA (7th ed.) Citation

Sage, A., & Zug, M. (2007). Septimus heap book 3: Physik (Book 3.). Harper Collins Publishers.

Chicago Style (17th ed.) Citation

Sage, Angie, and Mark Zug. Septimus Heap Book 3: Physik. Book 3. New York: Harper Collins Publishers, 2007.

MLA (9th ed.) Citation

Sage, Angie, and Mark Zug. Septimus Heap Book 3: Physik. Book 3. Harper Collins Publishers, 2007.