APA (7 वां संस्करण) प्रशस्ति पत्र

Okuma, P. C. (2013). Beyond witnessing: A new way of humanising the world (First edition.). Peter Lang.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Okuma, Peter Chidi. Beyond Witnessing: A New Way of Humanising the World. First edition. Frankfurt am Main ; New York: Peter Lang, 2013.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Okuma, Peter Chidi. Beyond Witnessing: A New Way of Humanising the World. First edition. Peter Lang, 2013.