APA
Bradfield P., Potter S., . (2004). Longman biology for IGCSE. Harlow, Essex, England: Pearson Education Ltd.
Chicago
Bradfield Phil, Potter Steve, . 2004. Longman biology for IGCSE. Harlow, Essex, England: Pearson Education Ltd.
Harvard
Bradfield P., Potter S., . (2004). Longman biology for IGCSE. Harlow, Essex, England: Pearson Education Ltd.
MLA
Bradfield Phil, Potter Steve, . Longman biology for IGCSE. Harlow, Essex, England: Pearson Education Ltd. 2004.