APA

Lincoln A., .The Gettysburg address and other speeches. Estados Unidos de América: Penguin Books.

Chicago

Lincoln Abraham, .The Gettysburg address and other speeches. Estados Unidos de América: Penguin Books.

Harvard

Lincoln A., .The Gettysburg address and other speeches. Estados Unidos de América: Penguin Books.

MLA

Lincoln Abraham, .Estados Unidos de América: Penguin Books. .