Genzmer, Herbert, author
Parragon, 2010
Buku Referensi
Talbot
Buku Teks
Berger, Morroe, author
Anchor Books, 1964
Buku Teks
Stair, Ralph M., Jr., author
Irwin, 1986
Buku Teks
edited by Don Hellriegel and John W. Slocum
Addison- Wesley , 1975
Buku Teks