I hope these links work.

www.birds.cornell.edu/BOW/YELWAR/
is from Cornell University. It shows illustrations of both male and female yellow warblers.

http://www.MBR-PWRC.USGS.GOV/ID/FRAMLST/i6520.html

That only has photos of the male, but also has a photo of a nest of eggs. I believe both sites have a link to a recording of the song.

Roberta