I'm writing a research paper...?

Yes. Anything you use in your paper you have to have the reference. Anything that is not your very own but used for your research.

Yes. Mention the registered trademark.

To do so, you just place an asterisk above the very last letter of the Brand Name; and, place the same asterisk as a foot note at the bottom of the same page, and explain: *Trademark

Now, if you have more than a Brand and all of them have trademarks, do the same on all of them IF explaining at the bottom with the-very-same-words.

If the trademark requires a different explanation (for ex. International Trademark), place "Two" asterisks above the brand, and same two at the bottom of the page.

If three different ones, the same procedure.

I hope I helped a little and wish you lots of luck!

every professor is different when it comes to works cited pages. If i were you, I would check with your teacher. If you can't ask your teacher before the paper is due, cite your references for the pictures just in case. A teacher will always be happier if you did too much work rather than not doing enough. You do not need the trademark symbol in your paper. I have never been docked for not having it.

If you use anything from another source which is not your own original work you need to reference it, or you could unwittingly face a charge of plagiarism or copyright violation.

I think the trademark and copyright signs are in the Webdings' fonts, but if you cannot find the copyright and or trademark sign, you can simply write (Trademark) or (Copyright) in brackets next to the first use of the sign/emblem and then (T) or (C) thereafter.

Chers :-)

you should cite them

and you should do that also

just go to symbols and it will be there