Bittel, L. R. (1976). Improving supervisory performance. McGraw-Hill Company.
Lua i Stíl Chicago (17ú heag.)Bittel, Lester R. Improving Supervisory Performance. New York: McGraw-Hill Company, 1976.
Lua MLA (9ú heag.)Bittel, Lester R. Improving Supervisory Performance. McGraw-Hill Company, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.