Collier, P. (2015). Choosing courage: Inspiring true stories of what it means to be a hero. Artisan.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCollier, Peter. Choosing Courage: Inspiring True Stories of What It Means to Be a Hero. New York: Artisan, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCollier, Peter. Choosing Courage: Inspiring True Stories of What It Means to Be a Hero. Artisan, 2015.
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