How to use other fonts in webpage?

I have a web developing job.
My client needs to add a font for heading in Webpage he requires the fonts not image,
Font is Amazon BT.
I tried to add that font but that is not showing on webpage.
That is replaced with default font in webpage.
Please let me know any solution if you have.
He has no any template but he is sure his friend had made like this website having this font.
