Ferguson, N., & Slack, P. (2013). The great degeneration: How institutions decay and economies die (Unabridged.). Recorded Books Inc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFerguson, Niall, और Paul Slack. The Great Degeneration: How Institutions Decay and Economies Die. Unabridged. Prince Frederick: Recorded Books Inc., 2013.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFerguson, Niall, और Paul Slack. The Great Degeneration: How Institutions Decay and Economies Die. Unabridged. Recorded Books Inc., 2013.
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