Wingate, M., & Koch, J. (2013). Perennials for the Pacific Northwest: 500 best plants for flower gardens. Sasquatch Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWingate, Marty, और Jacqueline Koch. Perennials for the Pacific Northwest: 500 Best Plants for Flower Gardens. Seattle, WA: Sasquatch Books, 2013.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWingate, Marty, और Jacqueline Koch. Perennials for the Pacific Northwest: 500 Best Plants for Flower Gardens. Sasquatch Books, 2013.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.