↑Nestell, P.N. & Nestell, K.N. (2006). Middle Permian (Late Guadalupian) foraminifers from Dark Canyon, Guadalupe Mountains, New Mexico. Micropaleontology, 52(1): 1-50.
↑Loeblich, A.R., Jr. y Tappan, H. (1987). Foraminiferal genera and their classification. Van Nostrand Reinhold Company (ed.), 2 vol., 1-970, 1-212 + 847 láminas.
↑Loeblich, A.R., Jr. y Tappan, H. (1992). Present Status of Foraminiferal Classification. Studies in Benthic Foraminifera en Benthos'90, Sendai (1990), Tokai University Press, 93-102.