Sisk, H. L. (1981). Management and organization (4ª ed.). South-Western.
Lua i Stíl Chicago (17ú heag.)Sisk, Henry L. Management and Organization. 4ª ed. South-Western, 1981.
Lua MLA (9ú heag.)Sisk, Henry L. Management and Organization. 4ª ed. South-Western, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.