Spencer-Wendel, S., & Witter, B. (2013). Until I say good-bye: My year of living with joy. HarperCollins.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSpencer-Wendel, Susan, और Bret Witter. Until I Say Good-bye: My Year of Living with Joy. New York: HarperCollins, 2013.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSpencer-Wendel, Susan, और Bret Witter. Until I Say Good-bye: My Year of Living with Joy. HarperCollins, 2013.
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