Lucas, Spencer G. (6 de novembro de 2018). «The GSSP Method of Chronostratigraphy: A Critical Review». Frontiers in Earth Science. 6. 191 páginas. doi:10.3389/feart.2018.00191
Knox, R.W.O’B.; Pearson, P.N.; Barry, T.L.; Condon, D.J.; Cope, J.C.W.; Gale, A.S.; Gibbard, P.L.; Kerr, A.C.; Hounslow, M.W.; Powell, J.H.; Rawson, P.F.; Smith, A.G.; Waters, C.N.; Zalasiewicz, J. (junho de 2012). «Examining the case for the use of the Tertiary as a formal period or informal unit». Proceedings of the Geologists' Association. 123 (3): 390–393. doi:10.1016/j.pgeola.2012.05.004
Gibbard, Philip L.; Smith, Alan G.; Zalasiewicz, Jan A.; Barry, Tiffany L.; Cantrill, David; Coe, Angela L.; Cope, John C. W.; Gale, Andrew S.; Gregory, F. John; Powell, John H.; Rawson, Peter F.; Stone, Philip; Waters, Colin N. (28 de junho de 2008). «What status for the Quaternary?». Boreas. 34 (1): 1–6. doi:10.1111/j.1502-3885.2005.tb01000.x
See, for example, Sahni, B. (1940). «Presidential Address: The Deccan Traps: An Episode of the Tertiary Era». Current Science. 9 (1): 47–54. JSTOR24204747
