Gorini, Catherine A., author
Course Technology Cengage Learning, 2012
Buku Teks
Walpole, Ronald E., author
Prentice-Hall, 1998
Buku Teks
Barnett, Frederic, author
Wadsworth, 1967
Buku Teks
Spiegel, Murray R., author
Erlangga, 2004
Buku Teks
Barnett, Frederic, author
Wadsworth, 1968
Buku Teks SO