Hubbard, L. Ron, 1911-1986
L. Ron Hubbard : a profile
Bridge Publications, Inc., 2012
 Buku Referensi
Bullis, L. Harold
Strategic and critical materials / L. Harold Bullis and James E. Mielke
Westview Press, 1985
 Buku Teks SO
Bullis, L. Harold
Strategic and critical materials / L. Harold Bullis and James E. Mielke
Westview Press, 1985
 Buku Teks
Bierman, Harold
Strategic financial planning : a manager`s guide to improving profit performance
The Free Press, 1980
 Buku Teks
Rohrs, Charles E.
Linear control systems / Charles E. Rohrs, James L. Melsa, Donald G. Schultz
McGraw-Hill, 1993
 Buku Teks