APA (7 वां संस्करण) प्रशस्ति पत्र

Keay, J. (2000). History: From the earliest civilizations to the boom of the twenty-first century (NA.). Harper Press.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Keay, John. History: From the Earliest Civilizations to the Boom of the Twenty-first Century. NA. London: Harper Press, 2000.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Keay, John. History: From the Earliest Civilizations to the Boom of the Twenty-first Century. NA. Harper Press, 2000.