Update README.md

ZXSpectrumVault · Oct 23, 2018 · 614e38c · 614e38c
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@@ -30,4 +30,9 @@ These disassemblies are annotated and documented by a variety of authors includi
 - Garry Lancaster
 - Ian Collier
 
+## Sources
 
+- [128K disassemblies](http://www.fruitcake.plus.com/Sinclair/Spectrum128/ROMDisassembly/Spectrum128ROMDisassembly.htm)
+- [ZX80, ZX81, 48K disassemblies](https://web.archive.org/web/20150430214523/http://www.wearmouth.demon.co.uk/)
+- [Information on who created what](http://scratchpad.wikia.com/wiki/Sinclair_BASIC_History)
+- [Online HTML cross-linked disassembly](https://skoolkid.github.io/rom/)