Cita APA (7th ed.)
Ramsden, E. N. (1994). A-level chemistry: E N Ramsden (3rd ed.). Stanley Thornes.
Cita Chicago (17th ed.)
Ramsden, E N. A-level Chemistry: E N Ramsden. 3rd ed. Cheltenham, England: Stanley Thornes, 1994.
Cita MLA (9th ed.)
Ramsden, E N. A-level Chemistry: E N Ramsden. 3rd ed. Stanley Thornes, 1994.
Atenció: Aquestes cites poden no estar 100% correctes.