APA (7th ed.) Citation

Donaldson, J., Kirtley, C., & Watson, R. (2006). Where were you, Bert? Parragon.

Chicago Style (17th ed.) Citation

Donaldson, Julia, Clare Kirtley, and Richard Watson. Where Were You, Bert? UK: Parragon, 2006.

MLA (9th ed.) Citation

Donaldson, Julia, et al. Where Were You, Bert? Parragon, 2006.