ALLEN, O. E. (1978). Pruning And Grafting Oliver E. Allen And Time-life Books. Time-Life Book.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रALLEN, Oliver E. Pruning And Grafting Oliver E. Allen And Time-life Books. Time-Life Book, 1978.
एमएलए (8वां संस्करण) प्रशस्ति पत्रALLEN, Oliver E. Pruning And Grafting Oliver E. Allen And Time-life Books. Time-Life Book, 1978.
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