Cita APA (7th ed.)

Hornby N. Nic & Collins A. Anne. (2003). About a Boy: Level 4. Harlow, Pearson Education, 2003.

Cita Chicago (17th ed.)

Hornby N. Nic i Collins A. Anne. About a Boy: Level 4. Harlow, Pearson Education, 2003, 2003.

Cita MLA (9th ed.)

Hornby N. Nic i Collins A. Anne. About a Boy: Level 4. Harlow, Pearson Education, 2003, 2003.