Oke, J., & Heller, J. (2004). Spring's gentle promise: Seasons of the heart (oke) series, book 4 (Unabridged.). Recorded Books Inc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रOke, Janette, और Johnny Heller. Spring's Gentle Promise: Seasons of the Heart (oke) Series, Book 4. Unabridged. Prince Frederick: Recorded Books Inc., 2004.
एमएलए (8वां संस्करण) प्रशस्ति पत्रOke, Janette, और Johnny Heller. Spring's Gentle Promise: Seasons of the Heart (oke) Series, Book 4. Unabridged. Recorded Books Inc., 2004.
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