1. Andors, A. V. (1988). Giant groundbirds of North America (Aves, Diatrymidae). Unpublished Ph.D. Thesis, Columbia University, New York.
2. Andors, A. V. (1992). Reappraisal of the Eocene groundbird Diatryma (Aves: Anserimorphae). Natural History Museum of Los Angeles County, Science Series,
36, 109–125.
3. Angst, D. (2014). Successeurs des dinosaures ? Paléobiologie et paléoécologie d’un Oiseau géant terrestre du Paléogène. Unpublished Ph.D. Thesis, Université Claude Bernard-Lyon 1, Lyon.
4. Angst, D., & Buffetaut, E. (2013). The first mandible of Gastornis Hébert, 1855 (Aves, Gastornithidae) from the Thanetian (Paleocene) of Mont-de-Berru (France). Revue de Paléobiologie,
32, 423–432.
5. Baumel, J. J., & Witmer, L. M. (1993). Osteologia. In J. J. Baumel (Ed.) Handbook of Avian Anatomy. Nomina Anatomica Avium, 2nd edition. Nuttall Ornithological Club, 23, 45–132.