Heartfield, James, author
Oxford University Press, 2017
eBooks
Larson, Laurence M., author
Holt , 1926
Buku Teks
Hall, Walter Phelps, author
Ginn and Company, 1953
Buku Teks
Richetti, John, author
John Wiley & Sons, 2017
Buku Teks
Schoch, Richard W., author
Cambridge University Press , 2016
Buku Teks