BUCKNER LEORY M. (1978). CUSTOMER SERVICES. MCGRAW-HILL.
Lua i Stíl Chicago (17ú heag.)BUCKNER LEORY M. CUSTOMER SERVICES. NEW YORK: MCGRAW-HILL, 1978.
Lua MLA (9ú heag.)BUCKNER LEORY M. CUSTOMER SERVICES. MCGRAW-HILL, 1978.
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