edited by James F. Short
Sage, Lond
Buku Teks SO
Farley, John E.
Prentice-Hall, 1992
Buku Teks SO
Nobbs, Jack
Macmillan Education, 1989
Buku Teks SO
Finsterbusch, Kurt
McGraw-Hill, 2006
Buku Teks SO
Kurt Finsterbusch, editor
McGraw-Hill, 2007
Buku Teks SO