Terry, George Robert, author
Richard D. Irwin, 1982
Buku Teks
Brown, Milon
Macmillan, 1956
Buku Teks
Luthans, Fred, author
McGraw-Hill , 1979
Buku Teks
Tagliaferri, Louise E.
John Wiley & Sons, 1979
Buku Teks
Boyd, Branford B., author
McGraw-Hill , 1984
Buku Teks