Santayana, George, author
Scribner, 1952
Buku Teks
MacLean, David, author
Houghton Mifflin Harcourt, 2014
Buku Teks
Garner, James Finn, author
Simon & Schuster , 1997
Buku Teks
Marker, Jamsheed, author
London : McFarland & Company, 2003, 2003
Buku Teks
Bryson, Bill, author
Broadway Books, 2006
Buku Teks