Cita APA (7a ed.)

Digby, B. (2001). Global challenges (1. publ.). Heinemann.

Cita Chicago Style (17a ed.)

Digby, Bob. Global Challenges. 1. publ. Oxford [u.a.]: Heinemann, 2001.

Cita MLA (9a ed.)

Digby, Bob. Global Challenges. 1. publ. Heinemann, 2001.