Bullfrog (Simple English Wikipedia)

"Lithobates catesbeianus". International Union for Conservation of Nature and Natural Resources. Archived from the original on 5 June 2011. Retrieved 18 June 2012.

libero.it (Global: 3,148^th place; Simple English: 6,358^th place)

digilander.libero.it

Francesco Ficetola, Gentile; Thuiller, Wilfried & Miaud, Claude. "Prediction and validation of the potential global distribution of a problematic alien invasive species — the American bullfrog" (PDF). Biodiversity Research. Diversity Distribution. Archived from the original (PDF) on 15 March 2016. Retrieved 11 July 2012.{{cite web}}: CS1 maint: multiple names: authors list (link)

nationalgeographic.com (Global: 489^th place; Simple English: 136^th place)

animals.nationalgeographic.com

"American Bullfrog". National Geographic. National Geographic Society. 10 October 2010. Retrieved 24 May 2012.

kids.nationalgeographic.com

Hughes, Catherine D. "American Bullfrog Facts and Pictures". National Geographic Kids. National Geographic Society. Archived from the original on 18 June 2012. Retrieved 16 July 2012.

naturemappingfoundation.org (Global: low place; Simple English: low place)

"American Bullfrog Facts". Washington NatureMapping. Retrieved 11 July 2012.

ontarionature.org (Global: low place; Simple English: low place)

Crowley, Joe. "American Bullfrog (Lithobates catesbeianus)". Ontario Nature. Ontario Nature Inc. Retrieved May 27, 2012.^{[permanent dead link]}

scientificamerican.com (Global: 1,110^th place; Simple English: 355^th place)

blogs.scientificamerican.com

Platt, John (13 December 2011). "Should California Ban American Bullfrogs?". Scientific American. Retrieved 19 June 2012.

seaworld.org (Global: low place; Simple English: 2,311^th place)

"Animal Profile: North American Bullfrog". Seaworld.org. Archived from the original on 30 July 2013. Retrieved 16 July 2012.

semanticscholar.org (Global: 15^th place; Simple English: 11^th place)

api.semanticscholar.org

Pauly, Gregory (2009). "Taxonomic Freedom and the Role of Official Lists of Species Names". Herpetologica. 65 (2): 128. Bibcode:2009Herpe..65..115P. doi:10.1655/08-031R1.1. S2CID 283839.

wcsu.edu (Global: low place; Simple English: low place)

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"Rana catesbeiana Shaw". wcsu.edu. Archived from the original on 14 August 2011. Retrieved 11 July 2012.

web.archive.org (Global: 1^st place; Simple English: 1^st place)

"Lithobates catesbeianus". International Union for Conservation of Nature and Natural Resources. Archived from the original on 5 June 2011. Retrieved 18 June 2012.
"Lithobates catesbeianus". United States Department of Agriculture. 4 April 2012. Archived from the original on 12 May 2012. Retrieved May 24, 2012.
"Rana catesbeiana Shaw". wcsu.edu. Archived from the original on 14 August 2011. Retrieved 11 July 2012.
"American Bull Frogs". Essortment. Archived from the original on 28 August 2012. Retrieved 27 May 2012.
"Animal Profile: North American Bullfrog". Seaworld.org. Archived from the original on 30 July 2013. Retrieved 16 July 2012.
Hughes, Catherine D. "American Bullfrog Facts and Pictures". National Geographic Kids. National Geographic Society. Archived from the original on 18 June 2012. Retrieved 16 July 2012.
"Invasive Species Profiles: Bullfrog". Invasive Species Profile.gov. United States Department of Agriculture. Archived from the original on 12 May 2012. Retrieved 11 July 2012.
Francesco Ficetola, Gentile; Thuiller, Wilfried & Miaud, Claude. "Prediction and validation of the potential global distribution of a problematic alien invasive species — the American bullfrog" (PDF). Biodiversity Research. Diversity Distribution. Archived from the original (PDF) on 15 March 2016. Retrieved 11 July 2012.{{cite web}}: CS1 maint: multiple names: authors list (link)

Bullfrog (Simple English Wikipedia)

adsabs.harvard.edu (Global: 14th place; Simple English: 17th place)

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libero.it (Global: 3,148th place; Simple English: 6,358th place)

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nationalgeographic.com (Global: 489th place; Simple English: 136th place)

animals.nationalgeographic.com

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naturemappingfoundation.org (Global: low place; Simple English: low place)

ontarionature.org (Global: low place; Simple English: low place)

scientificamerican.com (Global: 1,110th place; Simple English: 355th place)

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seaworld.org (Global: low place; Simple English: 2,311th place)

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wcsu.edu (Global: low place; Simple English: low place)

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essortment.com (Global: low place; Simple English: 4,213^th place)

iucnredlist.org (Global: 39^th place; Simple English: 22^nd place)

libero.it (Global: 3,148^th place; Simple English: 6,358^th place)

nationalgeographic.com (Global: 489^th place; Simple English: 136^th place)

scientificamerican.com (Global: 1,110^th place; Simple English: 355^th place)

seaworld.org (Global: low place; Simple English: 2,311^th place)

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web.archive.org (Global: 1^st place; Simple English: 1^st place)