Öpik, A. A. (1970). Nepeid trilobites of the Middle Cambrian of northern Australia. Bureau of Mineral Resources, Geology and Geophysics.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रÖpik, A. A. Nepeid Trilobites of the Middle Cambrian of Northern Australia. Canberra: Bureau of Mineral Resources, Geology and Geophysics, 1970.
एमएलए (8वां संस्करण) प्रशस्ति पत्रÖpik, A. A. Nepeid Trilobites of the Middle Cambrian of Northern Australia. Bureau of Mineral Resources, Geology and Geophysics, 1970.
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