New York : Cambridge University Press
Majalah, Jurnal, Buletin
Malmstrom, Jean
Hayden Book Company, 1965
Buku Teks
Bram, Joseph
Random House, 1955
Buku Teks
Downes, William
Cambridge University Press, 2003
eBooks
edited by Susan Ehrlich, Miriam Meyerhoff, and Janet Holmes
Wiley Blackwell, 2017
Buku Teks