Kobayashi & Hamada 1971. Silurian trilobites from the Langkawi Islands, West Malaysia, with notes on the Dalmanitidae and Raphiophoridae. Kobayashi, T. & Toriyama R. [Eds] Geology and palaeontology of Southeast Asia. 9., University of Tokyo Press, 1971: 87-134, 4 pls. Chapter pagination: 87-134, 4 pls