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2004
Tandy, M., Channing A., Poynton J. C., & Howell K. (2004).  Amietophrynus fuliginatus. IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. 2012,
Schiøtz, A., Howell K., & Lötters S. (2004).  Hyperolius cystocandicans. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2.
Moyer, D., Channing A., & Howell K. (2004).  Phrynobatrachus bullans. In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.2. <www.iucnredlist.org>.
Drewes, R., Howell K., & Lötters S. (2004).  Phrynobatrachus irangi. In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.2. <www.iucnredlist.org>.
Msuya, C., Howell K., Pickersgill M., Drewes R., & Lötters S. (2004).  Phrynobatrachus keniensis. In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.2. <www.iucnredlist.org>.
Msuya, C., Howell K., Lötters S., Pickersgill M., & Drewes R. (2004).  Phrynobatrachus kinangopensis. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2.
Loader, S., Poynton J., & Howell K. (2004).  Phrynobatrachus krefftii. In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.2. <www.iucnredlist.org>.
Poynton, J., Largen M., Howell K., Channing A., Minter L., & Lötters S. (2004).  Ptychadena anchietae. In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.2. <www.iucnredlist.org>.
Largen, M., & Howell K. (2004).  Ptychadena christyi. In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.2. <http://www.iucnredlist.org>..
2006
Channing, A., Howell K., & Loader S. (2006).  Callulina kisiwamsitu. In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.1. <www.iucnredlist.org>.
Channing, A., & Howell K. (2006).  Amphibians of East Africa. Comstock books in herpetology. 418 p., [24] p. of plates. Ithaca: Comstock Pub. Associates/Cornell University Press.