Lua APA (7ú heag.)

BIECH ELAINE. (2004). 2004 PFEIFFER ANNUAL: CONSULTING. PFEIFFER.

Lua i Stíl Chicago (17ú heag.)

BIECH ELAINE. 2004 PFEIFFER ANNUAL: CONSULTING. CALIFORNIA: PFEIFFER, 2004.

Lua MLA (9ú heag.)

BIECH ELAINE. 2004 PFEIFFER ANNUAL: CONSULTING. PFEIFFER, 2004.

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