Ople, B. F. Proposals for further development: Manpower planning ; vocational and career guidance. s.n.].
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रOple, Blas F. Proposals for Further Development: Manpower Planning ; Vocational and Career Guidance. [S.l: s.n.].
एमएलए (9वां संस्करण) प्रशस्ति पत्रOple, Blas F. Proposals for Further Development: Manpower Planning ; Vocational and Career Guidance. s.n.].
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