↑Dwight, T. (1902). Os intercuneiforme tarsi, Os paracuneiforme tarsi, Calcaneus secundarius. Anatomischer Anzeiger, 19-20, 465-472.
↑R. O'Rahilly. A survey of carpal and tarsal anomalies. J Bone Joint Surg Am. 1953; 35: 626-642
↑T. Tsuruta et al. [Radiological study of the accessory skeletal elements in the foot and ankle] (vertaald vanuit het Japans). Nippon Seikeigeka Gakkai Zasshi. 1981; 55: 357-370
↑T.E. Keats, M.W. Anderson. Atlas of normal roentgen variants that may simulate disease. 7th edition, Mosby Inc. 2001, ISBN 0323013228