Zajac, Alfed
D.C. Heath, 1966
Buku Teks SO
Perloff, William H.
John Wiley & Sons, 1976
Buku Teks
Sanford, R.J.
Pearson Education, Inc., 2003
Buku Teks SO
Harrison, H.B., 1930-
Edward Arnold, 1994
Buku Teks SO
Li, Wen-Hsiung
Addison-Wesley, 1964
Buku Teks SO