Original Artist for "This Christmas"

Who is the original artist for the song “This Christmas”. And is there a website where i can search for the different covers of it? When I search at amazon.com it ignores “this” and returns 5000 results for christmas.

I googled ‘This Christmas’, ‘original artist’ and my first suspect, Donny Hathaway. The first five cover versions all cite the Hathway song, so my guess is that’s the one you want.

Pretty song.