Wallace, Patricia M., author
Cambridge University Press, 2004.
Buku Teks
Channell, David F., author
Springer Cham, 2019
eBooks
Lieberman, Jethrok
Random House, 1992
Buku Teks
Languages Press, 1963
Buku Teks
Reinhardt, George C.
Dobleday, 1960
Buku Teks