Authors Year Title
Becker, Aboussalam & Bockwinkel 2004 The Givetian and Frasnian at Oued Mzerreb (Tata region, eastern Dra Valley). - [T.R. Becker, S.Z.Aboussalam, J.Bockwinkel, V. Ebbighausen, A. El Hassani & H.NĂ¼bel]
Devonian Neritic-Pelagic correlation and events in the Dra Valley (Western Anti-Atlas, Morocco,  A. El Hassani, ed., Docum.Inst.Scient., 19: 29-43, 1 pl., 4 fig., 2 tab.,Rabat.
Ebbighausen, Becker & Bockwinkel 2007 Givetian (Middle Devonian) brachiopod-goniatite-correlation in the Dra Valley (Anti-Atlas, Morocco) and Bergisch Gladbach-Paffrath Syncline (Rhenish Massif, Germany). [V.Ebbighausen,R.T.Becker,J.Bockwinkel & Z.S.Aboussalam].
Geological Society,London,Special Publications, 278_ 157-172, 9 fig., 1 tab., London.
Göddertz 1987 Devonische Goniatiten aus SW-Algerien und ihre stratigraphische Einordnung in die Conodonten-Abfolge.
Palaeontographica, Abt.A., 197 (4-6): 127-220, fig.1-42, pl.1-15; Stuttgart.
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.