, P. F. D. (1969). PREPARING TOMORROWS BUSINESS LEADERS TODAY. N.J. Prentice-Hall, Inc.
Lua i Stíl Chicago (17ú heag.), Peter F. Drucker. PREPARING TOMORROWS BUSINESS LEADERS TODAY. N.J. Prentice-Hall, Inc, 1969.
Lua MLA (8ú heag.), Peter F. Drucker. PREPARING TOMORROWS BUSINESS LEADERS TODAY. N.J. Prentice-Hall, Inc, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.