PHILLIPS JACK J. (1999). HRD TRENDS WORLDWIDE. GULF PUBLISHING CO.
Lua i Stíl Chicago (17ú heag.)PHILLIPS JACK J. HRD TRENDS WORLDWIDE. HOUSTON: GULF PUBLISHING CO, 1999.
Lua MLA (9ú heag.)PHILLIPS JACK J. HRD TRENDS WORLDWIDE. GULF PUBLISHING CO, 1999.
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