Carl Koch. (1982). Communication skills for college students. National Book Store.
Lua i Stíl Chicago (17ú heag.)Carl Koch. Communication Skills for College Students. Manila: National Book Store, 1982.
Lua MLA (9ú heag.)Carl Koch. Communication Skills for College Students. National Book Store, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.