Harrington, H. J., Weller, J. M., Howell, B. F., Whittington, H. B., Sdzuy, K., Schmidt, H., Stubblefield, C. J., Richter, R., Richter, E., Lochman-Balk, C., Rasetti, F., Størmer, L., Henningsmoen, G., Poulsen, C., Moore, R. C., Jaanusson, V., Tripp, R., & Struve, W. (1959). Part O, Arthropoda 1, ch. 1, p. 1-126. Treatise on Invertebrate Paleontology. https://doi.org/10.17161/dt.v0i0.5604