McCall Smith, A., & Porter, D. (2009). The lost art of gratitude (Unabridged.). Recorded Books Inc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMcCall Smith, Alexander, और Davina Porter. The Lost Art of Gratitude. Unabridged. Prince Frederick: Recorded Books Inc., 2009.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMcCall Smith, Alexander, और Davina Porter. The Lost Art of Gratitude. Unabridged. Recorded Books Inc., 2009.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.