"Developers Guide", "Developers' Guide", or "Developer's Guide"

[Andrew McFarland]

Hi,

I need help with an apostrophe.

Which of these is correct?

* "Developers Guide" i.e. "The guide for the developers"
* "Developers' Guide" i.e. "The guide belonging to the developers"
* "Developer's Guide" i.e. "The guide belonging to the developer"

I can see a case for all three, and can fund any guidance in my normal
reference books.

Andrew
-- 
You did not read the manual
Our tech writer is sad
Locked in the toilet, he is  crying