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2. Nonmarine perigondwanic trace fossils from the Late Paleozoic of Argentina;Aceñolaza;Ichnos,1993
3. Azambuja Filho, N.C., Spadini, A.R., 1994. Field Trip Guide to Sergipe–Alagoas Basin. 14th Int. Sedimentol. Congr. Recife, 26 pp.
4. Bromley, R.G., 1990. Trace Fossils. Biology and Taphonomy. Unwin Hyman, London, 280 pp.
5. Bromley, R.G., 1996. Trace Fossils. Biology, Taphonomy and Applications. Chapman and Hall, London, 361 pp.