Which of the following shows the correct way to write a quotation in a research essay?
Because of Joplin's musical contribution, "ragtime is now a permanent part of the American musical landscape" (Berlin "Biography").
"Ragtime is now a permanent part of the American musical landscape" (said by Edward Berlin).
Quotation: Ragtime is now a permanent part of the American musical landscape. (Edward Berlin "Biography").
Edward Berlin said, ragtime is now a permanent part of the American musical landscape because of Joplin's musical contribution (Berlin, "Biography").
Berlin thinks that ragtime is now a permanent part of "American musical landscape" (Biography).