Pigg, K.B.; Manchester S.R.; Wehr W.C. (2003). "Corylus, Carpinus, and Palaeocarpinus (Betulaceae) from the Middle Eocene Klondike Mountain and Allenby Formations of Northwestern North America". International Journal of Plant Sciences. 164 (5): 807–822. doi:10.1086/376816. S2CID19802370.
Dlussky, G.M. (2012). "New Fossil Ants of the Subfamily Myrmeciinae (Hymenoptera, Formicidae) from Germany". Paleontological Journal. 46 (3): 288–292. doi:10.1134/s0031030111050054. S2CID83891156.
Dlussky, G.M.; Putyatina, T.S. (2014). "Early Miocene ants (Hymenoptera, Formicidae) from Radoboj, Croatia". Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. 272 (3): 237–285. CiteSeerX10.1.1.692.9292. doi:10.1127/0077-7749/2014/0409.
K. Jeffrey Bickart (1981). "A New Thick-knee, Burhinus, from the Miocene of Nebraska, with Comments on the Habitat Requirements of the Burhinidae (Aves: Charadriiformes)". Journal of Vertebrate Paleontology. 1 (3–4): 273–277. doi:10.1080/02724634.1981.10011902.
Cyril A. Walker (1981). "New Subclass of Birds from the Cretaceous of South America". Nature. 292 (5818): 51–53. doi:10.1038/292051a0. S2CID4340858.
Storrs L. Olson (1986). "A Replacement Name for the Fossil Penguin Microdytes Simpson (Aves: Spheniscidae)". Journal of Paleontology. 60 (3): 785. doi:10.1017/S0022336000022332. S2CID140620588.
Pigg, K.B.; Manchester S.R.; Wehr W.C. (2003). "Corylus, Carpinus, and Palaeocarpinus (Betulaceae) from the Middle Eocene Klondike Mountain and Allenby Formations of Northwestern North America". International Journal of Plant Sciences. 164 (5): 807–822. doi:10.1086/376816. S2CID19802370.
Dlussky, G.M. (2012). "New Fossil Ants of the Subfamily Myrmeciinae (Hymenoptera, Formicidae) from Germany". Paleontological Journal. 46 (3): 288–292. doi:10.1134/s0031030111050054. S2CID83891156.
Cyril A. Walker (1981). "New Subclass of Birds from the Cretaceous of South America". Nature. 292 (5818): 51–53. doi:10.1038/292051a0. S2CID4340858.
Storrs L. Olson (1986). "A Replacement Name for the Fossil Penguin Microdytes Simpson (Aves: Spheniscidae)". Journal of Paleontology. 60 (3): 785. doi:10.1017/S0022336000022332. S2CID140620588.
Gini-Newman, Garfield; Graham, Elizabeth (2001). Echoes from the past: world history to the 16th century. Toronto: McGraw-Hill Ryerson Ltd. ISBN9780070887398. OCLC46769716.
Smiley, C.J.; Huggins, L.M. (1981). "Pseudofagus idahoensis, n. gen. et sp. (Fagaceae) from the Miocene Clarkia flora of Idaho". American Journal of Botany. 68 (6): 741–761. ISSN0002-9122.