"CCSID 1020 information document". Archived from the original on 2016-03-27. https://web.archive.org/web/20160327100344/http://www-01.ibm.com/software/globalization/ccsid/ccsid1020.html
"Code page 1020 information document". Archived from the original on 2016-08-10. https://web.archive.org/web/20160810191109/https://www-01.ibm.com/software/globalization/cp/cp01020.html
"VT220 Programmer Reference Manual" (2 ed.). Digital Equipment Corporation (DEC). 1984 [1983]. http://vt100.net/docs/vt220-rm/
DEC (February 1992) [November 1989]. "Chapter 2: Character Encoding - National Replacement Character Sets (NRC Sets) (Worldwide Models Only)". VT420 Programmer Reference Manual (PDF) (2 ed.). Digital Equipment Corporation. p. 28. EK–VT420–RM.002. Archived (PDF) from the original on 2017-01-29. Retrieved 2017-01-29. http://manx-docs.org/collections/mds-199909/cd3/term/vt420rm2.pdf
Code Page CPGID 01020 (pdf) (PDF), IBM https://public.dhe.ibm.com/software/globalization/gcoc/attachments/CP01020.pdf
Code Page CPGID 01020 (txt), IBM https://public.dhe.ibm.com/software/globalization/gcoc/attachments/CP01020.txt