Wolfe, A., & Helman, A. (1995). O is for orca: A Pacific Northwest alphabet book. Sasquatch Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWolfe, Art, और Andrea Helman. O Is for Orca: A Pacific Northwest Alphabet Book. Seattle: Sasquatch Books, 1995.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWolfe, Art, और Andrea Helman. O Is for Orca: A Pacific Northwest Alphabet Book. Sasquatch Books, 1995.
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