[R] Chao
Chao S. (1962). [Concerning a new species of Psittacosaurus from Layjyang, Shantung.] Vertebrata PalAsiatica 6: 349-360. (Chinese with Russian summary) [Psittacosaurus youngi]
Chao T-K, & Chiang Y.-K. (1974) Microscopic studies on the dinosaurian eggshells from Laiyang, Shantung province. Scientia Sinica 17:71-83.
Chao, Y. (1993) Reconstruction of the skull of Diplodocus and the phylogeny of the Diplodocidae (Dinosauria: Sauropoda). Ph.D. dissertation, University of Chicago, 1-143