Treatise on invertebrate paleontology
by Geological Society of America, Clark, David L., Robison, Richard A., Kaesler, Roger L., Callomon, John H., Howarth, Michael K., Moore, Raymond C., Hess, Hans, Messing, Charles G., Boardman, R. S., Bulman, O. M. B., Finks, Robert M., Furnish, William M., Hill, Dorothy, Reid, R. E. H., Rigby, J. Keith, Teichert, Curt, Williams, Alwyn, Wright, Claud William