	Authors	Year	Title
	House	1978	Devonian amonoids from the Appalachians and their bearing on international zonation and corelation. Special Papers Paleontology, 21: 1-70, fig.1-12, pl.1-10; London.
	Klug	2002	Quantitative stratigraphy and taxonomy of late Emsian and Eifelian ammonoids of the eastern Anti-Atlas (Morocco). Courier Forschungsinstitut Senckenberg, 238: 1-109, 44 fig., 13 pl., 23 tab., Frankfurt.