Tropical Fish Hobbyist, August, 1986: 11-49 regions and the "Rio Içá" discus from western Amazonia in the 1970s and 1980s.
Tropical Fish Hobbyist, August, 1986: 11-49 regions and the "Rio Içá" Hans J.Mayland. Diskus Fieber by Landbuch-Verlag GmbH, Hannover discus from western Amazonia in the 1970s and 1980s.