Billings, Diane M.
Elsevier/Saunders, 2012
Buku Teks
Bellings, Diane M.
Saunders Elsevier, 2009
Buku Teks
Moche, Dinah L.
John Wiley & Sons, 1981
Buku Teks
Moulton, William G.
Modern Language Association of America, 1966
Buku Teks SO
Warhus, Susan
McGraw-Hill, 2007
Buku Teks