Rainey, Hal G.
John Wiley & Sons, 2003
Buku Teks
Greenberg, Jerald
Prentice-Hall, 2003
Buku Teks
Greenberg, Jerald
Pearson Education International, 2003
Buku Teks
Greenberg, Jerald
Pearson Education, 2003
Buku Teks
Hunt, John W.
McGraw-Hill, 1976
Buku Teks SO