http://en.wikipedia.org/wiki/Roland_E-20

http://www.answers.com/topic/e20

http://www.answers.com/topic/e20-norr

http://www.roland-industrial-electronics.com/products.php?lang=1&pID=1&pgID=1

http://debuggi.cn/roland-keyboard

http://en.wikipedia.org/wiki/Roland_corporation

http://www.musicmix.se/

http://safemanuals.com/brand-user-guide-instructions-owner-manual/ROLAND

http://www.roland-industrial-electronics.com/support.php?lang=1

http://sv.wikizic.org/Roland-E20/reviews-1.htm

http://www.synthmuseum.com/roland/index.html

http://www.buzzle.com/articles/roland-keyboards-instrument.html

http://www.roland-electronic.com/products.php?lang=1&pID=1&pgID=1

http://www.instrumentswap.co.uk/listing/id/listing/id/9

http://fi.wikizic.org/Roland-E20/forum-1.htm

http://forums.dpreview.com/forums/read.asp?message=6295040

http://www.roland-electronic.com/support.php?lang=1

http://homepage.mac.com/synth_seal/html/mt32e.html

http://www.memoryx.net/ole20me.html

http://safemanuals.com/zearch_602.php