http://documentation.microfocus.com/help/topic/com.microfocus.eclipse.infocenter.visualcobol.2017/HRLHLHPDF90C.html?cp=5_8_3_1_3_4_8_31 ... inspect

http://www.open-std.org/jtc1/sc22/open/ISO-IECJTC1-SC22_N4561_ISO_IEC_FCD_1989__Information_technol.pdf ... 2014

https://upload.wikimedia.org/wikipedia/commons/2/27/COBOL_Report_Apr60.djvu ... 1960

https://open-cobol.sourceforge.io/guides/GNU%20COBOL%202.0%20Programmers%20Guide.pdf ... GNU COBOL 2.0

http://www.fujitsu.com/jp/documents/products/software/middleware/business-middleware/middleware/cobol/technical/manual/j2s0-0437-01z0.pdf ... Fujitsu (japonsky)

http://www.fujitsu.com/global/products/software/developer-tool/netcobol/index.html ...

http://www-03.ibm.com/software/products/en/cobocompfami ...