edited by Mari Pritchard Parker, Elvio Angeloni
McGraw-Hill, 2013
Buku Teks
Worldmark Press, 1960
Buku Referensi
edited by Susan E. Alcock, Robin Osborne
Blackwell, 2007
Buku Teks
Mongait, Alexander, author
Foreign Languages Publishing House, 1959
Buku Teks
Watson, William, author
Max Parrish, 1960
Buku Teks