Bonatelli, M., M. R. F. Machado, C. Cruz, and M. A. Miglino. “Morphological Analysis of the Placenta of Paca (Agouti Paca L., 1766): Study With Light Microscopy and Transmission Electron Microscopy”. Brazilian Journal of Veterinary Research and Animal Science, vol. 38, no. 5, Jan. 2001, pp. 224-8, doi:10.1590/S1413-95962001000500005.