More Forth references

I found some more interesting references:

• Forth Interpreter ・ A very nice and clearly written piece by Laurence Kesteloot.
• The corresponding TRS-80 Forth
• An interpreter for a concatenative language ・ Written as a series of comments on HackerNews.
• Cear Blum’s sectorforth ・ An implementation in less than 512 byte (direct threaded).
• R. G. Loeliger. 1981. Threaded Interpretive Languages. Their Design and Implementation. Byte Books