Hasegawa, Noriyoshi
Page one publishing pte ltd, 2010
Buku Teks SO
Christensen, Howard B.
Hoghton Mifflin, 1977
Buku Teks
Hasegawa, Noriyoshi
Prgeone, 2006
Buku Teks SO
University of Foreign Studies, [date of publication not identified]
Buku Teks
Kellett, Mary
Paul Chapman Publishing, 2005
Buku Teks SO