1. Ballard, O. T. (1937). The gross anatomy of Cavia cobaya with a comparative study of another hystricomorph rodent; Erethizon dorsatus, Ph.D. Thesis, University of Kansas, Lawrence.
2. Barnes, R. D. (1972). Unpublished Auto tutorial. “Special Anatomy of Laboratory Mammals.” University of California, Davis.
3. Postnatal growth in weight of the body and the various organs in the guinea pig;Bessesen;Amer. J. Anat.,1922
4. Studies of the pancreas of the guinea pig;Bensley;Amer. J. Anat.,1911
5. Vascular anatomy of the uterus and ovaries and the unilateral luteolytic effect of the uterus: Guinea pigs, rats, hamsters and rabbits;Del Campo;Amer. J. Res.,1972