Dennis M. Ritchie, "The Development of the C Language," History of Programming Languages - II (ACM Press and Addison-Wesley, 1996). Also available online at http://cm.bell-labs.com/cm/cs/who/dmr/chist.html (AT&T, accessed 2004 Nov 20).

http://www.fortran-2000.com/ArnaudRecipes/CompMuseum.html  - Interesting collection, including links on Fortran and C

http://www.fortran.com/ibm.html  - Autographed IBM 704 Fortran Manual

http://www.fh-jena.de/~kleine/history/http://www.oberon.ch/resources/component_pascal/history.html  - Historic documents for Fortran, Algol 60, Pascal, C, others (PDF)

http://www.oberon.ch/resources/component_pascal/history.html  - Pascal history

http://merd.net/pixel/language-study/concepts-history.html  - Language concepts

http://merd.net/pixel/language-study/diagram-light.png  - Chart main

http://merd.net/pixel/language-study/diagram.png  - Chart detailed

http://merd.net/pixel/language-study/index.html  - parent site

http://www.levenez.com/lang/ - even more detailed chart and a list of languages

http://www.masswerk.at/algol60/report.htm  - Algol 60 report

http://www.engin.umd.umich.edu/CIS/course.des/cis400/index.html  - Language guide