Cita APA (7a ed.)

Digby, B. (2002). Global challenges (1. publ., 2. [impr.].). Heinemann.

Cita Chicago Style (17a ed.)

Digby, Bob. Global Challenges. 1. publ., 2. [impr.]. Oxford [u.a.]: Heinemann, 2002.

Cita MLA (9a ed.)

Digby, Bob. Global Challenges. 1. publ., 2. [impr.]. Heinemann, 2002.