WEIHRICH, H. (1985). Management Excellence Productivity Througt Mbo Heinz Weihrich. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)WEIHRICH, Heinz. Management Excellence Productivity Througt Mbo Heinz Weihrich. McGraw-Hill, 1985.
Lua MLA (8ú heag.)WEIHRICH, Heinz. Management Excellence Productivity Througt Mbo Heinz Weihrich. McGraw-Hill, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.