Não informado. (1956). Journal of the Rio Grande Valley Horticultural Society. Rio Grande Valley Horticultural Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Journal of the Rio Grande Valley Horticultural Society. Weslaco, Tex: Rio Grande Valley Horticultural Society, 1956.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Journal of the Rio Grande Valley Horticultural Society. Rio Grande Valley Horticultural Society, 1956.
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