Παραπομπή σε μορφή APA (7η εκδ.)

Helm, D. (2003). Energy, the state, and the market: British energy policy since 1979. Oxford University Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Helm, Dieter. Energy, the State, and the Market: British Energy Policy Since 1979. Oxford: Oxford University Press, 2003.

Παραπομπή σε μορφή MLA (9th εκδ.)

Helm, Dieter. Energy, the State, and the Market: British Energy Policy Since 1979. Oxford University Press, 2003.