Wang, Franklin F.Y.
North-Holland, 1980
Buku Teks
Thomason, Michael
Reston Publishing, 1979
Buku Referensi
Elliott, Roger J.
English Language Book Society, 1978
Buku Teks SO
Streetman, Ben G.
Pearson, 2015
Buku Teks
Kittel, Charles
John Wiley & Sons, 1986
Buku Teks SO