Block, P. (1981). Flawless Consulting (sco 2nd.). Jossey-Bass.
Lua i Stíl Chicago (17ú heag.)Block, Peter. Flawless Consulting. sco 2nd. San Franci: Jossey-Bass, 1981.
Lua MLA (9ú heag.)Block, Peter. Flawless Consulting. sco 2nd. Jossey-Bass, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.