PARSONS WJ. (1982). IMPROVING PURCHASING PERFORMANCE. GOWER.
Lua i Stíl Chicago (17ú heag.)PARSONS WJ. IMPROVING PURCHASING PERFORMANCE. ENGLAND: GOWER, 1982.
Lua MLA (9ú heag.)PARSONS WJ. IMPROVING PURCHASING PERFORMANCE. GOWER, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.