1. Miocene bird track and take off imprints in the Upper Red Formation, western Mushampa, northwest Zanjan, Iran;Abbassi;Journal of Sciences, University of Tehran,2005
2. Allen, J.R.L., 1982. Sedimentary Structures — Their Character and Physical Basis. Developments in Sedimentology 30, vol. II. Elsevier, Amsterdam.
3. Subfossil mammalian tracks (Flandrian) in the Severn Estuary, S.W. Britain: mechanics of formation, preservation and distribution;Allen;Transactions of the Royal Society, London B,1997
4. Tracks, trails and trampling by large vertebrates in a rift valley paleo-wetland, lowermost Bed II, Olduvai Gorge, Tanzania;Ashley;Ichnos,2002
5. Huellas y señales de los animales de Europa;Bang,1975