Robertson, F.A.
Airspeak: radiotelephony communications for pilots / F.A. Robertson
Prentice-Hall, 1987, 1987
 Buku Teks
Hornsby, Beve, author
Alpha to omega : the A-Z of teaching, reading, writing and spelling / Beve Hornsby and Frula Shear
Heinemann , 1993
 Buku Teks
Shepherd, James F., author
RSVP the Houghton Mifflin reading, study, and vocabulary program
Houghton Miffiln, 1984
 Buku Teks
Cunningham, Sarah, author
Everyday listening and speaking : intermediate
Oxford University Press, 1994
 Buku Teks
Cunningham, Sarah, author
Everyday listening and speaking pre-intermediate
Oxford University Press , 1994
 Buku Teks
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