Gradstein, F. M., Ogg, James G., Smith, Alan G.
Cambridge University Press
|
Barker, Peter F., Cooper, Alan K.
|
Harland, Walter Brian, 1917-
Cambridge University Press
|
|
Gould, Stephen Jay, 1942-
Penguin
|
Smith, George I., Benson, Larry V., Currey, Donald R., American Geophysical Union., International Geological Congress
|
Thornes, John B., Brunsden, Denys
Methuen
|
|
Cahen, L. (Lucien), Snelling, N. J.
Clarendon Press
|
Péwé, Troy Lewis, Reger, R. D., American Geophysical Union., International Geological Congress
|
Cooper, Alan K., Barker, Peter F., Brancolini, Giuliano.
|
Cecil, C. B., Eble, Cortland., American Geophysical Union., International Geological Congress
|