Johnson, D. W. (1978). The care and feeding of volunteers. Abingdon.
Lua i Stíl Chicago (17ú heag.)Johnson, Douglas W. The Care and Feeding of Volunteers. Nashville: Abingdon, 1978.
Lua MLA (9ú heag.)Johnson, Douglas W. The Care and Feeding of Volunteers. Abingdon, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.