edited by James F. Short
Sage Publications, Lond
Buku Teks SO
Calhoun, Craig J.
McGraw-Hill , 1994
Buku Teks
Farley, John E.
Prentice-Hall, 1992
Buku Teks SO
Nobbs, Jack
Macmillan Education, Ltd., 1989
Buku Teks SO
Finsterbusch, Kurt
McGraw-Hill, 2006
Buku Teks SO