Fischer, Louis, author
Harper & Row, 1964
Buku Teks
Herndon, William H.
Fawcett, 1965
Buku Teks
Moscow : The USSR Society for Cultural Relations with Foreign Countries (VOKS)
Majalah, Jurnal, Buletin
Schiff, Stacy, author
Little, Brown and Company , 2010
Buku Teks
Facey, A. B., author
Penguin Books, 1981
Buku Teks