Howgate 1985. Problems of the osteology of Archaeopteryx - is the Eichstatt specimen a distinct genus? Hecht, M.K.; Ostrom, J.H.; Viohl, G.; Wellnhofer, P.[Eds]. The Beginnings of Birds. Proceedings of the International Archaeopteryx Conference, Eichstatt 1984., Freunde des Jura-Museums Eichstatt, Eichstatt, 1985: 185-197. Chapter pagination: 105-112