1. Allen, J. A., 1904. Mammals from southern Mexico and Central and South America. Bull. Mus. Am. Nat. Hist. 20: 29?80.
2. Bangs, O., 1902. Chiriqui Mammalia. Bull. Mus. Comp. Zool. 39: 17?51.
3. Baker, R. J., Barnett, R. K. & Greenbaum, I. F., 1979. Chromosomal evolution in grasshopper mice (Onychomys: Cricetidae). J. Mammal. 60: 297?306.
4. Brown, M., 1980. Trypsin, G-bands using Wright's Sect 4, pp 47?48. In. The Association of Cytogenetic Technologists Cytogenetics laboratory manual (M.S.Hack & H. J.Lawce, eds). Univ. Assoc. of Cytogenetic Technologists, University of California, San Francisco.
5. Carleton, M. D., 1980. Phylogenetic relationships in neotomineperomyscine rodents (Muroidea) and a reappraisal of the dichotomy within the New World cricetinae. Misc. Publs Mus. Zool. Univ. Mich. 157: 1?146.