Butterfield, J. (2018). Soft Skills for Everyone. Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Butterfield, Jeff. Soft Skills for Everyone. Delhi: Cengage Learning, 2018.
Lua MLA (9ú heag.)Butterfield, Jeff. Soft Skills for Everyone. Cengage Learning, 2018.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.