Παραπομπή σε μορφή APA (7η εκδ.)

Ople, B. F. Proposals for further development: Manpower planning ; vocational and career guidance. s.n.].

Παραπομπή σε μορφή Chicago (17η εκδ.)

Ople, Blas F. Proposals for Further Development: Manpower Planning ; Vocational and Career Guidance. [S.l: s.n.].

Παραπομπή σε μορφή MLA (9th εκδ.)

Ople, Blas F. Proposals for Further Development: Manpower Planning ; Vocational and Career Guidance. s.n.].