If you are using a quote from author A that author B is citing you would go ahead and use the quote from author A and cite it like so:

Blah blah, blahblahblah, blah blah blah-blah blah (qtd. in Author B 65).

Obviously it should not be in bold, I just used it for emphasis.

If you are using a quote from author A that author B is citing, you would go ahead and use the quote from author A and cite it like this:

Blah blah, blahblahblah, blah blah blah-blah blah (qtd. in Author B 65).

if you are using a quote from author A that your paper's author B is citing you would go ahead and use the quote from author A and site it like so:

Blah blah, blahblahblah, blah blah blah-blah blah (qtd. in Author B 65).

obviously it wouldnt need to be in BOLD i just used it for emphasis.

If you are using a quote from author A that author B is citing you would go ahead and use the quote from author A and cite it like so:

Blah blah, blahblahblah, blah blah blah-blah blah (qtd. in Author B 65).

Obviously it should not be in bold, I just used it for emphasis.