Cita APA (7th ed.)
Kenny, N. First certificate: Practice tests (3a. ed.).
Cita Chicago (17th ed.)
Kenny, N. First Certificate: Practice Tests. 3a. ed.
Cita MLA (9th ed.)
Kenny, N. First Certificate: Practice Tests. 3a. ed.
Atenció: Aquestes cites poden no estar 100% correctes.