SCHAEFER SUSAN DAVIDSON. (1977). MOTIVATION PROCESS. WINTHROP PUBLISHERS.
Lua i Stíl Chicago (17ú heag.)SCHAEFER SUSAN DAVIDSON. MOTIVATION PROCESS. CAMBRIDGE: WINTHROP PUBLISHERS, 1977.
Lua MLA (9ú heag.)SCHAEFER SUSAN DAVIDSON. MOTIVATION PROCESS. WINTHROP PUBLISHERS, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.