Kogan. (1973). Public relation. Alexander Hamilton Inst.
Lua i Stíl Chicago (17ú heag.)Kogan. Public Relation. New York: Alexander Hamilton Inst, 1973.
Lua MLA (9ú heag.)Kogan. Public Relation. Alexander Hamilton Inst, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.