A very good reference is

http://paulbourke.net/texture_colour/colourspace/

Of course the code is given in C++.

Explicit equations are given on

http://www.rapidtables.com/convert/color/hsv-to-rgb.htm

How did I find this?

Google with the search phrases:

1. hsv2rgb theory

2. hsv2rgb conversion equations

So, just by giving appropriate search, you will get almost everything on net. Of course, to download certain things, subscription may be required.

Kindly thanks