Dhogal, P.S., author
Tata McGraw-Hill, 1995
Buku Teks
Fitzgerald, A.E. (Arthur Eugene), 1909-, author
Erlangga, 1985
Buku Teks
Paul, C. R.
McGraw-Hil Book Company, 1986
Buku Teks
Smith, I. McKenzie
Longman, 1990
Buku Teks
Dargan, C.R.
Tata McGraw-Hill , 1994
Buku Teks