	Authors	Year	Title
	Furnish & Saunders	1971	Ammonoids from the Middle Chester Beech Creek Limestone, St. Clair County. University of Kansas paleontological Contributions, 51: 1-14, fig.1-3, pl.1-2.
	Korn	1988d	Die Goniatiten des Kulmplattenkalkes (Cephalopoda, Ammonoidea; Unterkarbon; Rheinisches Schiefergebirge). Geologie und Paläontologie in Westfalen, 11: 1-293, fig.1-88, pl.1-60; Münster.
	Korn	1997	The Palaeozoic ammonoids of the South Portuguese Zone. Memórias do Instituto geológico e Mineiro 33: 1-131, 69 text-figs., 16 pls., Lisboa.
	Moore	1936	The Bowland Shales from Pendle to Dinckley. Journal of the Manchester Geological Association,: 167-192, fig.1-3, pl.1-3; Manchester.
	Pruvost	1914	Observations sur les terrains Dévoniens et Carbonifères du Portugal et leur faune. Comunicaçoes da Comissao do Serviço Geológico de Portugal, 10: 1-22, fig.1-2; Lisboa.