Dyfyniad APA

(1992). Public-sector aviation issues: Graduate research award papers, 1990-1991. Transportation Research Board, National Research Council.

Dyfyniad Arddull Chicago

Public-sector Aviation Issues: Graduate Research Award Papers, 1990-1991. Washington, D.C: Transportation Research Board, National Research Council, 1992.

Dyfyniad MLA

Public-sector Aviation Issues: Graduate Research Award Papers, 1990-1991. Transportation Research Board, National Research Council, 1992.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.