Egmose, Jonas
Routledge, 2015
Buku Teks SO
Robson, Colin
Oxford, 2002
Buku Teks SO
Seltzer, Richard A.
St. Martin`s Press, 1996
Buku Teks SO
Leavitt, Fred
C. Brown Publishers, 1991
Buku Teks SO
Badawy, Michael K.
Van Nostrand Reinhold, 1995
Buku Teks SO