Cita APA (7th ed.)

Catrin Brown. (2014). Higher level Chemistry (2nd edition.). Pearson education.

Cita Chicago (17th ed.)

Catrin Brown. Higher Level Chemistry. 2nd edition. Essex: Pearson education, 2014.

Cita MLA (9th ed.)

Catrin Brown. Higher Level Chemistry. 2nd edition. Pearson education, 2014.