[18 references]
· Burch, J.B. and Thompson, F.G. 1957. Three New Mexican Land Snails of the Genus Humboldtiana. Occ.Papers Mus.Zool. Univ. Michigan, No. 590, pp. 1-11, pl. I-V.

· Clench, W.J. and Rehder, H.A. 1930. A new Humboldtiana from Texas. Nautilus 44 (1): 10-13, pl. 2, figs. 1-4.

· Fullington, R.W. and Zimmerman, E.G. 1978. A New Species of Humboldtiana (Helminthoglyptidae) from Coahuila, Mexico. The Veliger, Vol. 20(2):134-136, figs. 1-6.

· Drake, R.J. 1951. Humboldtiana taylori, New Species, From Northern Coahuila. Revista de la Sociedad Malacologica, Vol. 8(2):93-96, Pl.13.

· Metcalf, A.L. 1983. A New Humboldtiana (Pulmonata: Helminthoglyptidae) From Northwestern Coahuila, Mexico. The Nautilus, Vol. 97(2):69-72.

· Metcalf, A.L. 1984. A New Humboldtiana (Pulmonata: Helminthoglyptidae) From Extreme Eastern Chihuahua, Mexico. The Nautilus, Vol. 98(4):145-147.

· Metcalf, A.L. and Riskind, D.H. 1976. A New Humboldtiana (Pulmonata: Helminthoglyptidae) From Coahuila, Mexico. The Nautilus, Vol. 90(3):99-100.

· Metcalf, A.L. and Riskind, D.H. 1980. New Information Concerning Humboldtiana taylori Drake, 1951. The Veliger, Vol. 22(2):179-181, figs. 1-4.

· Parodiz, J.J. 1954. A new species of Humboldtiana from Texas.. The Nautilus, Vol.67(4):107-108.

· Pilsbry, H.A. 1939. Land Mollusca of North America (North of Mexico).. ANSP Monographs No.3, Vol. I, Part I, pp. 395-410.

· Pilsbry, H.A. 1948. Inland Mollusks of Northern Mexico.-I. The Genera Humboldtiana, Sonorella, Oreohelix and Ashmunella.. Proc. Acad. Nat. Sci. Phil., Vol. C, pp. 185-203.

· Solem, A. 1954. Notes on Mexican Mollusks. I: Durango, Coahuila and Tamaulipas, with Description of Two New Humboldtiana. The Nautilus, Vol. 68(1)5-10.

· Solem, A. 1955. New and Little-Known Mexican Helicidae (Mollusca, Pulmonata). The Nautilus, Vol. 69(2):40-44.

· Solem, A. 1973. On the Affinities of Humboldtiana fullingtoni Cheatum, 1972. The Veliger, Vol.16(4):359-365.

· Thompson, F.G. and Brewer, G.P. 2000. Landsnails of the Genus Humboldtiana from Northern Mexico (Gastropod, Pulmonata, Helicoidea, Humboldtianidae). Bull. Florida Mus. Nat. Hist. 43(2):49-77.

· Thompson, F.G. 2006. A new land snail of the genus Humboldtiana (Gastropoda: Pulmonata: Humboldtianidae) from Nuevo León, Mexico. The Nautilus, Vol. 120(1):21-24.

· Thompson, F.G. 2006. Two new land snails of the genus Humboldtiana (Gastropoda: Pulmonata: Humboldtianidae) from Chihuahua, Mexico. The Nautilus, Vol. 120(1):25-29.

· Underwood, Jr., J.R. and Wilson J.A. 1974. Earliest Known Occurrence of Land Snail Humboldtiana: From Tuff of Garren Group (Oligocene), Trans-Pecos Texas. Journal of Paleontology, Vol. 48(3):596-597.