Primary references

• Ladiges, W.; 1975: Betta imbellis nov. spec., der Friedliche Kampffisch. Die Aquarien und Terrarien-Zeitschrift (DATZ) 28 (8): 262–264.

• Tan, H.H. & P.K.L. Ng, 2005. The fighting fishes (Teleostei: Osphronemidae: genus Betta) of Singapore, Malaysia and Brunei. Raffles Bulletin of Zoology Suppl. no. 13: 43-99.

Additional references

• Kowasupat, C., Panijpan, B.., Laosinchai, P., Ruenwongsa, P., Phongdara, A., Wanna, W., Senapin, S. & Phiwsaiya, K. 2014. Biodiversity of the Betta smaragdina (Teleostei: Perciformes) in the northeast region of Thailand as determined by mitochondrial COI and nuclear ITS1 gene sequences. Meta Gene 2: 83–95. DOI: /10.1016/j.mgene.2013.12.004 Reference page. 

• Kottelat, M. 2013. The fishes of the inland waters of southeast Asia: a catalogue and core bibiography of the fishes known to occur in freshwaters, mangroves and estuaries. Raffles Bulletin of Zoology Supplement No. 27: 1–663. Full issue (PDF). Reference page. 
• Ng, P.K.L., J.B. Tay, K.K.P. Lim & C.M. Yang, 1992. The conservation of the fish and other aquatic fauna of the North Selangor peat swamp forest and adjacent areas. Asian Wetland Bureau, Institute of Advanced Studies University of Malaya, WWF and National University of Singapore

• Witte, K.-E. & Schmidt, J. 1992. Betta brownorum, a new species of anabantoids (Teleostei: Belontiidae) from northwestern Borneo, with a key to the genus. Ichthyological Exploration of Freshwaters 2(4): 305–330. Reference page. 

Links

• Betta imbellis Report on ITIS

• Betta imbellis in FishBase,
  Froese, R. & Pauly, D. (eds.) 2020. FishBase. World Wide Web electronic publication, www.fishbase.org, version 02/2019.

• Betta imbellis in Catalog of Fishes,
  Eschmeyer, W.N., Fricke, R. & van der Laan, R. (eds.) 2020. Catalog of Fishes electronic version.
• Betta imbellis in the World Register of Marine Species
• NCBI link: Betta imbellis
• IUCN: Betta imbellis  (Least Concern)