Cullina, W. (2004). Understanding orchids: An uncomplicated guide to growing the world's most exotic plants. Houghton Mifflin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCullina, William. Understanding Orchids: An Uncomplicated Guide to Growing the World's Most Exotic Plants. Boston: Houghton Mifflin, 2004.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCullina, William. Understanding Orchids: An Uncomplicated Guide to Growing the World's Most Exotic Plants. Houghton Mifflin, 2004.
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