1. CLEMENS, W.A., U CALIFORNIA PUBLICA 48: 1 (1963).
2. DAVIS, D. H. S., OSTRICH 3: 144 (1959).
3. DODSON, P, UNIVERSITY OF WYOMING CONTRIBUTIONS TO GEOLOGY 12: 17 (1973).
4. DOUGLAS, A. M., JOURNAL OF THE ROYAL SOCIETY OF WESTERN AUSTRALIA 49: 88 (1966).
5. EMRY, R, SOCIETY OF VERTEBRATE PALEONTOLOGY NEWS BULLETIN 97 27 (1973).