Hybels, S. (1986). Communicating effectively. Random House.
Lua i Stíl Chicago (17ú heag.)Hybels, Saundra. Communicating Effectively. Random House, 1986.
Lua MLA (9ú heag.)Hybels, Saundra. Communicating Effectively. Random House, 1986.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.