1. Axelrod HR 2001. Discovery of the cardinal tetra and beyond. In Conservation and management of aquatic resources of the Rio Negro Basin Amazonia Brazil Proceedings of an International Workshop on Amazon River biodiversity Chao NL Petry P Sonneschein L Tlusty MF eds Universidade do Amazona Press Manaus Brazil.
2. Bertram I 1995. The aquarium fishery in the Cook Islands. Is there a need for management? Joint FFA/SPC workshop on the management of South Pacific inshore fisheries. (Noumea New Caledonia 26 June-7 July 1995) compiled by Dalzell P Adams TJH Vol.II. pp.1-5.
3. Chao NL 1998. A draft list of Brazilian freshwater fishes for the hobby—a proposal to IBAMA. Ornamental Fish Int. J. 23: 11 –19.
4. Chao NL Dowd S Tlusty MF 2001. Project Piaba: buy a fish save a tree. Am. Zool. Assoc. Communique 14 16 January.
5. Chao NL Prada-Pedreros ES 1995. O cardinal tetra Paracheirodon axelrodi e diversidade dos peixes ornamentais do Rio Negro Amazonas. Anais do VII Congresso Brasileiro de Engenharia de Pesca Santos-SP 22 a 26 de julho de 1991. Associacao dos Engenheiros de pesca de Pernambuco Recife 1994 pp. 35– 51.