Malmstrom, Jean, author
National Council of Teachers of English , 1963
Buku Teks
Grassmann, H.
Wiesbaden Harrassowitz 1955
Buku Referensi
Biers, William R
Routledge, 1992
Buku Teks
Jakarta : Yayasan Atma Jaya (NUSA)
Majalah, Jurnal, Buletin
O`grady, William
Cambridge University Press, 2007
Buku Teks