(1979). Service Management. s.n.
Cita Chicago Style (17a ed.)Service Management. s.n, 1979.
Cita MLA (8a ed.)Service Management. s.n, 1979.
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Cita APA (7a ed.)
(1979). Service Management. s.n.
Cita Chicago Style (17a ed.)Service Management. s.n, 1979.
Cita MLA (8a ed.)Service Management. s.n, 1979.