APA (7 वां संस्करण) प्रशस्ति पत्र

Butterworth, C. W. Ethical and political philosophy: Charles W. Butterworth. The Cambridge Companion to Arabic philosophy.(2006).

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Butterworth, Charles W. "Ethical and Political Philosophy: Charles W. Butterworth." The Cambridge Companion to Arabic Philosophy.(2006) .

एमएलए (8वां संस्करण) प्रशस्ति पत्र

Butterworth, Charles W. "Ethical and Political Philosophy: Charles W. Butterworth." The Cambridge Companion to Arabic Philosophy.(2006), .