wp-caption-text – alternatives?

Currently my wp-caption-text is as follows:

p.wp-caption-text {
font-size: 14px;
line-height: 20px;
font-weight: bold;

This serves perfectly for my own images.

Occasionally I add an image which I need to attribute & I find that my wp-caption-text is too big and strong.

Is it possible to have an alternative wp-caption-text just for such attribution which would be smaller, italic and floated right?