Anderson, Edward, F.: The Cactus Family, English, Timber Press, Inc., Portland, Oregon, U.S.A., 2001

Anderson, Edward, F.: Das grosse Kakteen-Lexikon, revised by Urs Eggli, German, Ulmer, Stuttgart 2005

Backeberg, Curt: Die Cactaceae - Band 3: Cereoideae, German, Gustav-Fischer-Verlag, Jena 1959

Backeberg, Curt: Kakteenlexikon, German, Jena 1966

Berger, Alwin: Die Kakteen, German, Eugen Ulmer, Stuttgart 1929

Haage: Kakteen von A bis Z, German, Neumann Verlag, Leipzig, Radebeul 1981

Hunt, David: CITES Cactaceae Checklist Second Edition Royal Botanic Gardens Kew & International Organization for Succulent Plant Study IOS, London 1999

Hunt, David: The New Cactus Lexicon, dh books, Milborne Port 2006

Metzing, Detlev; Meregalli, Massimo; Kiesling, Roberto: An annotated checklist of the genus Gymnocalycium Pfeiffer ex Mittler (Cactaceae), English, in Allionia 33: 181-228, Turin 1995

Metzing, Detlev; Meregalli, Massimo; Borgmann, Wolfgang: An annotated checklist of the genus Gymnocalycium Pfeiffer ex Mittler - Addenda et Corrigenda, English, Compiled by David Hunt in Cactaceae Consensus Initiatives, issue 6, 1998-12, Sherborne

Papsch, Wolfgang: Namensverzeichnis der Gattung Gymnocalycium, German, Knittelfeld 1996

Pilbeam, J.: Gymnocalycium. A Collector's Guide, English, A.A. Balkema Publishers, Rotterdam/Brookfield 1995

Preston-Mafham, Rod & Ken: Kakteenatlas, German, translated by Holger Dopp, Eugen Ulmer, Stuttgart 1992; Many excellent colour photos, almost species of Gymnocalyciums

Putnam, E. W.: Gymnocalyciums - A Guide for Growers, English, British Cactus & Succulent Society, Oxford 1978

Schneekloth, Bernd: Ein Gymnocalycium Verzeichnis, German, Trier 1994 and 2000

Schütz, Bohumil: Monographie der Gattung Gymnocalycium, German, Realization W. Papsch & G. Hold, Graz/Knittelfeld 1992

Catálogo de las Plantas Vasculares de la República Argentina. II - Cactaceae, Instituto de Botánica Darwinion, San Isidro, Argentina

Journals

Albaflora/Anisitsianum - Journals of the Hungarian Cactus Society

Cactaceae Systematics Initiatives - Bulletin of the International Cactaceae Sysiematics Group, Edited and published for ICSG by David Hunt PhD

Hickenia - Boletín del Darwinion, Instituto de Botánica, San Isidro, Argentina

Kakteen/Sukkulenten - Periodical of the German Democratic Republic, 1966 to 1990, published four times a year.

Kakteen und andere Sukkulenten - Journal of the German Speaking Cacti Societies, since 1950 by Deutsche Kakteengesellschaft e.V., Oos-Str. 18, D-75179 Pforzheim (Publisher also in Austria and in the Swiss), every month, ISSN 0022-7846, subscription 35 Euro a year;

Gymnos - Journal of the Work Group "Gymnocalycium" of the German Cacti Society "Deutsche Kakteengesellschaft e.V.", German, from 1984 to 1995, published two times a year; AG Gymnocalycium, Wolfgang Borgmann, Goffartstr. 40, D-52066 Aachen; ISSN 0931-6043;

Gymnocalycium - Journal of the Work Group "Gymnocalycium" (Austria) since 1988, German, this is published four times a year by Arbeitsgruppe Gymnocalycium, Bahnweg 12, A-5301 Eugendorf, ISSN 1017-9178, subscription Europe 30 Euro, other 35 Euro a year;