Ople, B. F. Proposals for further development: Manpower planning ; vocational and career guidance. s.n.].
Lua i Stíl Chicago (17ú heag.)Ople, Blas F. Proposals for Further Development: Manpower Planning ; Vocational and Career Guidance. [S.l: s.n.].
Lua MLA (9ú heag.)Ople, Blas F. Proposals for Further Development: Manpower Planning ; Vocational and Career Guidance. s.n.].
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.