Howell, D. W. (1987). Principles & methods of scheduling reservations (2nd ed.). Elmsford, NY: National Publishers of the Black Hills.
Παραπομπή Chicago StyleHowell, David W. Principles & Methods of Scheduling Reservations. 2nd ed. Elmsford, NY: National Publishers of the Black Hills, 1987.
Παραπομπή MLAHowell, David W. Principles & Methods of Scheduling Reservations. 2nd ed. Elmsford, NY: National Publishers of the Black Hills, 1987.
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