Cita APA (7a ed.)

Sherran, P., & Crawshaw, J. (1997). A level questions and answers q & a pure maths (1a ed.). Letts Educational.

Cita Chicago Style (17a ed.)

Sherran, Peter, y Janet Crawshaw. A Level Questions and Answers Q & a Pure Maths. 1a ed. London: Letts Educational, 1997.

Cita MLA (9a ed.)

Sherran, Peter, y Janet Crawshaw. A Level Questions and Answers Q & a Pure Maths. 1a ed. Letts Educational, 1997.