Dyfyniad APA

ebrary, Inc. (1987). Directions in engineering research: An assessment of opportunities and needs. National Academy Press.

Dyfyniad Arddull Chicago

ebrary, Inc. Directions in Engineering Research: An Assessment of Opportunities and Needs. Washington, D.C.: National Academy Press, 1987.

Dyfyniad MLA

ebrary, Inc. Directions in Engineering Research: An Assessment of Opportunities and Needs. National Academy Press, 1987.

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