Barnum, Susan R., author
Wadsworth, 1998
Buku Teks
Gilmore, Charles M., author
McGraw-Hill, 1981
Buku Teks
Madura, Jeff, author
South-Western College, 2001
Buku Teks
Wilson, J. (John), author
Prentice-Hall, 1983
Buku Teks
Lesk, Arthur M, author
Oxford University Press, 2017
Buku Teks