1. Bouvier, E.-L. 1905. Monographie des Onychophores. I. Ann. Sci. Nat. Zool. (9)2:1–383.
2. Bouvier, E.-L. 1907. Monographie des Onychophores. II. Ann. Sci. Nat. Zool. (9)5:61–318.
3. Brinck, P. 1956. Ch. 1. Onychophora. A review of the South African species, with a discussion on the significance of the geographical distribution of the group, pp. 7–32. In: Hanstrom, B. et al. (eds.), South African animal life, Vol. 4. Almquist & Wiksell Stockholm.
4. Brues, C. T. 1923. The geographical distribution of the Onychophora. Amer. Nat. 57:210–217.
5. Bursell, E., Ewer, D. W. 1950. On the reactions to humidity of Peripatopsis mosleyi (Wood-Mason). J. Exp. Biol. 26:235–253.