Payne, H. E. (1972). Plant jewels of the high country: "sempervivums and sedums,". Pine Cone Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPayne, Helen E. Plant Jewels of the High Country: "Sempervivums and Sedums,". Medford, Or.: Pine Cone Publishers, 1972.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPayne, Helen E. Plant Jewels of the High Country: "Sempervivums and Sedums,". Pine Cone Publishers, 1972.
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