Skidmore, Rex A. (Rex Austin), author
Prentice Hall International, 1991
Buku Teks
Collins, Donald, author
Brooks/Cole Cengage Learning, 2013
Buku Teks
Farley, O. William, 1934-, author
Pearson Education, 2012
Buku Teks
Coulshed, Veronica, author
Macmillan, 1988
Buku Teks
Skidmore, Rex A. (Rex Austin), author
Prentice-Hall, 1994
Buku Teks