Παραπομπή APA

Powell, T. (2001). The transport system: Markets, modes and policies. London: PTRC Education and Research Services Ltd.

Παραπομπή Chicago Style

Powell, Tim. The Transport System: Markets, Modes and Policies. London: PTRC Education and Research Services Ltd, 2001.

Παραπομπή MLA

Powell, Tim. The Transport System: Markets, Modes and Policies. London: PTRC Education and Research Services Ltd, 2001.

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