Cita APA (7a ed.)

Kelly, N., & Lacey, G. (2001). Modern world history for OCR specification 1937 (1. publ.). Heinemann.

Cita Chicago Style (17a ed.)

Kelly, Nigel, y Greg Lacey. Modern World History for OCR Specification 1937. 1. publ. Oxford: Heinemann, 2001.

Cita MLA (9a ed.)

Kelly, Nigel, y Greg Lacey. Modern World History for OCR Specification 1937. 1. publ. Heinemann, 2001.