APA
Hirst K., . (2002). AS biology, unit 1, AQA specification B. module 1, core principles. London: Philip Allan Updates.
Chicago
Hirst Keith, . 2002. AS biology, unit 1, AQA specification B. module 1, core principles. London: Philip Allan Updates.
Harvard
Hirst K., . (2002). AS biology, unit 1, AQA specification B. module 1, core principles. London: Philip Allan Updates.
MLA
Hirst Keith, . AS biology, unit 1, AQA specification B. module 1, core principles. London: Philip Allan Updates. 2002.