How are UK comics quoted values determined?

[Nagorama]

I made a very short and non-exhaustive list below. I don't know where to put it on a more permanent basis. The reference section maybe?

Websites and/or Publications of reference for the quoted values of comic books.
The resources listed below can be used by collectors to determine the value of a comic book.
- Ebay comics dealer Phil Shrimpton:
http://www.phil-comics.com/
- Comic Price Guide, for UK and US comics (paid subscription):
http://www.comicpriceguide.co.uk
-The Overstreet Comic Book Price Guide (US comics):
http://www.gemstonepub.com/comic-book-price-guide
- 30th Century Comics, a shop specialised in vintage UK and US comics:
http://30thcenturycomics.co.uk/

[starscape]

It's worth pointing out that Phil's Comics, for some reason, attract higher than usual prices and that 30th C Comics are retail prices. Fine for insurance purposes but not for re-selling.