Fahrner, W. F. (1965). Basic rules of alphabetic filing Programmed instruction. SouthWestern.
Cita Chicago (17th ed.)Fahrner, William F. Basic Rules of Alphabetic Filing Programmed Instruction. SouthWestern, 1965.
Cita MLA (9th ed.)Fahrner, William F. Basic Rules of Alphabetic Filing Programmed Instruction. SouthWestern, 1965.
Atenció: Aquestes cites poden no estar 100% correctes.