Numerical methods and phylogeny of the Calceocrinidae

Kesling, R. V., and Sigler, J. P., 1969,Cunctocrinus, a new Middle Devonian calceocrinid crinoid from the Silica Shale of Ohio: Michigan Univ. Museum Paleo. Contr., v. 22, p. 339–360.

Moore, R. C., 1962, Revision of the Calceocrinidae: Kansas Univ. Paleo. Contr., Art. 4, 40 p.

Rohlf, F. J., 1968, Stereograms in numerical taxonomy: Systematic Zoology, v. 17, p. 246–255.

Rowell, A. J., in press, The contribution of numerical taxonomy to the genus concept: North American Paleontological Cong. (Chicago) symposium volume.

Sokal, R. R., and Sneath, P. H. A., 1963, Principals of numerical taxonomy: W. H. Freeman & Co., San Francisco, 359 p.

Wagner, W. H., Jr., 1954, The fern genusDiella: California Univ. Publ. Botany, v. 26, p. 1–167.

Wagner, W. H., Jr., 1961, Problems in the classification of ferns,in Recent advances in botany (9th Inter. Bot. Cong., Montreal, 1959), v. 1, sec. 9, p. 841–844.