Aft, L. S. (1983). Productivity measurement and improvement. Reston Pub. Co.
Lua i Stíl Chicago (17ú heag.)Aft, Lawrence S. Productivity Measurement and Improvement. Reston, Va: Reston Pub. Co, 1983.
Lua MLA (9ú heag.)Aft, Lawrence S. Productivity Measurement and Improvement. Reston Pub. Co, 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.