APA (7th ed.) Citation

Clegg, J., Gareth Price, & Mike Smith. (2006). IGCSE for edexcel biology. Harper Collins Publishers.

Chicago Style (17th ed.) Citation

Clegg, Jackie, Gareth Price, and Mike Smith. IGCSE for Edexcel Biology. London: Harper Collins Publishers, 2006.

MLA (9th ed.) Citation

Clegg, Jackie, et al. IGCSE for Edexcel Biology. Harper Collins Publishers, 2006.