Cornwell, K.
English Language Book, 1981
Buku Teks SO
Holman, Jack Philip
Mc-Graw-Hill , 1997
Buku Teks SO
Isachenko, V. P.
MIR Publishers, 1977
Buku Teks SO
Eckert, E.R.G.
Tata McGraw-Hill, 1979
Buku Teks SO
Holman, Jack Philip
Erlangga, 1991
Buku Teks SO